* updated go version requirement to go1.19
* updated dependencies, excepted:
   * yaml (upgrade to v3 deferred to another PR)
   * otel (upgrade is breaking: deferred to another PR)

* ci: updated linting rules, in line with other go-openapi repos
   * exception: disabled the "nilerr" linter, which currently crashes for
     this repo
* ci:updated github actions, in line with other go-openapi repos
* doc: updated README links and badges

* major relinting of all test code
* relinting non-test code is deferred to another PR (hopefully with less changes)
* changes to non-test code are limited to:
  * addition of (temporary) nolint directives
  * gofmt/typos in comments
  * unused params

TODO in forthcoming PRs:
* [ ] upgrade to yaml/v3
* [ ] upgrade OTEL packages
* [ ] gradually remove most "nolint" directives in non-test code
* [ ] complete test refactoring: some nolint directives have been added
      to skip more complex refacoring (e.g. duplicate code)

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

chore: relint & update

* NOTE: otel v1.17.0 is the last version supporting go1.19.
  more recent otel packages (now v1.21.0) require go1.20.

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

* fixes #245

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

closed

* fixes #268

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

This phase applies trivial relinting fixes, to keep the amount of
changes reviewable.

Non-trivial fixes are deferred to a follow-up PR.

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

* addressed code duplication in tests
* used sub tests to improve readability
* covered a few additional edged cases (passing unexpected types, empty
  realm)

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

chore: relinting, continued

test: refact tests for authenticators