As pointed out by the [bowtie
report](https://bowtie.report/#/dialects/draft4?language=php) there
where some issues when validating the uniqueness of values espec. when
the order of the keys was different.

Add missing breaking change to upgrade guide

Fixes #822

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

This brings the `Constraint` class to PHP 7.2 language level and does
some cleanup along the way.

This pull request introduces a new GitHub Actions workflow for
continuous integration on a 32-bit system. The workflow is configured to
run tests using PHP 8.4 and includes steps for environment setup and
test execution.

### New Continuous Integration Workflow:

*
[`.github/workflows/continuous-integration-32-bit.yml`](diffhunk://#diff-913f89970936b1231274367aff0161dfd9c5ca768783bdf9d1e1961b59aad86eR1-R38):
Added a new workflow named "Continuous Integration" that triggers on
`push` and `pull_request` events targeting the `master` branch. It runs
on `ubuntu-latest` using a 32-bit container
(`shivammathur/node:latest-i386`) and sets up PHP 8.4 with specific
extensions, tools, and configuration before executing tests via
`composer test`.

Fixes #818

This pull request refactors the `BaseConstraint` class in the
`JsonSchema` package to improve code readability, enforce immutability,
and align with modern PHP practices. The changes include replacing
anonymous functions with static closures, updating type casting, and
removing outdated comments.

### Code modernization and immutability:

* Replaced anonymous functions with `static` closures in methods like
`addError`, `addErrors`, and `convertJsonPointerIntoPropertyPath` to
enforce immutability and improve performance.
[[1]](diffhunk://#diff-05cd63f6b003f185a215e10402525e33d94466ec4d83a685c5a6ccd1befcf921L53-R48)
[[2]](diffhunk://#diff-05cd63f6b003f185a215e10402525e33d94466ec4d83a685c5a6ccd1befcf921L81-R75)
[[3]](diffhunk://#diff-05cd63f6b003f185a215e10402525e33d94466ec4d83a685c5a6ccd1befcf921L167-R162)
* Updated type casting for better readability and adherence to modern
PHP conventions, e.g., `(string)` instead of `strval`.

### Code readability and cleanup:

* Removed outdated docblock comments and unnecessary annotations, such
as the `@return` tag in `convertJsonPointerIntoPropertyPath`.
* Replaced `\JSON_ERROR_NONE` with the `JSON_ERROR_NONE` constant for
consistency with the `use` statement.

### Other improvements:

* Adjusted the `json_decode` call to explicitly set the `associative`
parameter to `false` for clarity.

This PR will:
- Scan schemas that are being added for `id` properties and register
them if valid schemas
- Avoid altering the `id` for sibling `ref` properties
- Don't register schema or expand refs when found in enum or const

This will fix #827

This PR improves the test cases classes and addresses some small fixes
of issues which exposed themselves.

This PR will:
- Update all data providers to return `Generator` objects.
- Remove file headers with a license reference in favour of the
`LICENSE.md` at the root
- Remove class docbocks which where defining unused attributes
- Add `declare(strict_types=1);` to all test files
- Replace class strings with their resp. `::class` constant.
- More updates bringing test files to PHP 7.2 level using rector

This pull request updates the `json-schema/json-schema-test-suite`
dependency to a newer version and introduces a new test suite for
validating JSON schemas. The goal here is to have a quicker turnaround
then just the bowtie reports. The most important changes are grouped
below:

### Dependency Updates:
* Updated `json-schema/json-schema-test-suite` dependency in
`composer.json` from version `1.2.0` to `^23.2` and updated the package
version and reference in the `repositories` section to match the new
version.
[[1]](diffhunk://#diff-d2ab9925cad7eac58e0ff4cc0d251a937ecf49e4b6bf57f8b95aab76648a9d34L36-R36)
[[2]](diffhunk://#diff-d2ab9925cad7eac58e0ff4cc0d251a937ecf49e4b6bf57f8b95aab76648a9d34L62-R66)

### New Test Suite:
* Added a new `JsonSchemaTestSuite` class in
`tests/JsonSchemaTestSuite.php` to run validation tests using the
`json-schema/json-schema-test-suite`. This includes:
  - A `testIt` method to validate test cases and assert results.
- A `casesDataProvider` method to dynamically load test cases from the
`json-schema-test-suite` repository, skipping certain drafts.
- A `loadRemotesIntoStorage` helper method to load remote schemas into
the schema storage.

Replaces #840 (due to blocked write access on fork)

---------

Co-authored-by: Andy Postnikov <apostnikov@gmail.com>

#842)

This PR will 
- add PHP 8.5 to the continuous integration pipeline, ignoring platform
dependencies
- resolve deprecations for:
  -  Reflection*::setAccessible
  - curl_close
  - $http_response_header

Fixes #798