pantsbuild/pants release_2.33.0a0

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Prepare 2.33.0a0 (#23506)

Free-threaded: Native, thread-safe instance memoization (#23492)

Fix issues with the pex_binary reference doc page (#23508)

perf: Make rule introspection cheaper at import time (#23507)

Remove legacy dockerfile parser (#23324)

update the default Pex version to 2.97.1 (#23501)

bugfix: Stop misaligning docker build args on invalid address references (#23425)

Update scalameta to support new given syntax (SIP-64) (#22921)

admit concurrently() items through a semaphore window (#23486)

perf: Reduce allocation churn in PosixFS::scandir_sync (#23393)

Free-threaded: Engine groundwork for performant free-threading (#23489)

Free-threaded: Thread safe internals (#23491)

Free-threaded: Abiflags aware build artifacts (#23497)

Write index config to both uv.toml and pyproject.toml (#23483)

migrate to REAPI output_paths (#23294)

add Buildbarn integration tests for REAPI (#23484)

enable resolves_to_uploaded_prior_to for our own lockfile(s)#23440 (#23473)

Flaky test fix: Write wrapper-script test scripts from a child process (#23498)

gitignore scala/metals IDE artifacts (#23500)

Skip queueing workunit messages for consumers that never poll to avoid unbound memory growth (#23485)

Free-threaded: Export free threaded site packages (#23488)

Free-threaded: Drop hdrhistorgram python dependency (#23490)

Free-threaded: Upgrade psutil (#23487)

Permit vfork fast-path within local execute_process (#23466)

Significantly reduce engine coroutine memory overhead (#23481)

Upgrade pex to v2.97.0 (#23482)

drop support for EoL Python 3.9 in bundled lockfiles (#23464)

update bundled sqlfluff tool version to 4.x (#23462)

preserve "pyside2" test in dedicated resolve (#23460)

drop python3.9 specific tests that use the bundled lockfiles (#23457)

add a resolve toggle for bundled lockfiles (#23445)

provide an explicit shebang for the mypy shell script (#23479)

plumb thru --validate-entry-point as a field (#23474)

Pass the same set of object files when retrying linking for cgo (#23447)

Accept new #cgo directives introduced by go 1.24 (#23439)