[3.12] build: enable aarch64 optimizations - #906

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/meta.yaml:

• ℹ️ The recipe is not parsable by parser conda-souschef (grayskull). This parser is not currently used by conda-forge, but may be in the future. We are collecting information to see which recipes are compatible with grayskull.
• ℹ️ The recipe is not parsable by parser conda-recipe-manager. The recipe can only be automatically migrated to the new v1 format if it is parseable by conda-recipe-manager.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/32581065656. Examine the logs at this URL for more detail.}

@msarahan @xhochy @scopatz @pelson @ocefpaf @jakirkham @chrisburr @isuruf @mbargull @katietz

Could you please review this PR when possible? It is now rebased onto the latest 3.12 branch and the merge conflict has been resolved. The diff remains limited to removing the three-line Linux AArch64 optimization guard and bumping the build number. Thank you!