Switch to arm64 runners on macOS

[dbwiddis]

Description

Switches the CI GitHub runners for macOS to macos-latest now that an OpenSearch arm64 build is available.

Related Issues

Resolves #712

Check List

• [ ] New functionality includes testing.
• [ ] New functionality has been documented.
• [ ] API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• [ ] Public documentation issue/PR created.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.76%. Comparing base (f40890c) to head (2665ade).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #794      +/-   ##
============================================
+ Coverage     75.68%   75.76%   +0.07%     
  Complexity      833      833              
============================================
  Files            88       88              
  Lines          4035     4035              
  Branches        371      371              
============================================
+ Hits           3054     3057       +3     
+ Misses          828      824       -4     
- Partials        153      154       +1     

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/flow-framework/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/flow-framework/backport-2.x
# Create a new branch
git switch --create backport/backport-794-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 f3a9e99665711d7b7183aef5a4ff60038f21c285
# Push it to GitHub
git push --set-upstream origin backport/backport-794-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/flow-framework/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-794-to-2.x.