Entries to ACVM changelog get added to every version instead of just the version in which they are made.

[TomAFrench]

Expected Behavior

A PR should only appear once in the changelog for ACVM

Bug

See: https://github.com/noir-lang/noir/blob/master/acvm-repo/CHANGELOG.md

acvm_js: Export black box solver functions (https://github.com/noir-lang/noir/issues/2812) ([da8a98e](https://github.com/noir-lang/noir/commit/da8a98ed312fe69cb0bdb8f9d0a70ee7a981398f)) appears 8 times.

Looking at #3603 we can see that the pending entries don't get cleared out after we make a release