Relies on scala#23695 to land on next base version

Backports #23695 to the 3.7.3-RC2.

PR submitted by the release tooling.

Relies on scala#23695 to land on next base version

<!--
- **Add capture checking to boundary and NonLocalReturns**
- **Add capture-checking test for boundary**
- **Patch DropBreaks to correctly detect boundary blocks**
- **Add capture checking to CommandLineParser**
- **Add capture checking to scala.util**
- **Add capture checking to scala.runtime**
- **Add capture checking to rest of scala.runtime (except
TupledFunctions)**
- **Add capture checking to IArray**
- **[TODO INVESTIGATE] IArray: `Array[AnyRef^{xs*}]` not working, revert
cast**
- **Add capture checking to various scala.* base package files**
- **[TODO FIX] Temporarily drop upper bound of higher-kinded type `F` in
tuple match types**
- **Add capture checking to scala.reflect**
- **[TODO REMOVE] Add TODO list**
- **[TODO EXPLAIN] Add capture checking to Mirror and TupleMirror**
- **Add capture checking to scala.caps**
- **Add capture checking to compiletime.Ops**
- **Add capture checking to stdLibPatches**
- **Add capture checking to annotations**
- **Attempt to capture-check quotes**
- **Track sun.misc.Unsafe in LazyVal implementation**
- **Require Conversion to be pure**
-->

## List of changes

- Capture checking enabled for all files except listed in the next
section
- `boundary` is now capture-checked, preventing `Label` from being
leaked outside of its corresponding `boundary`. Requires #23507.
- `

## Files missing capture checking 

- [ ] `Tuple.scala`, waiting for #23695 to reach the next base version
- [ ] `Mirror.scala`, which requires auto-generated Mirrors to be
compatible with extending one of the `caps.Capability` subtraits.
Currently the plan is to simply ban case classes.

---------

Co-authored-by: Hamza Remmal <hamza@remmal.net>