Prepare for 14.0.0~pre3 Release

[azeey]

🎈 Release

Preparation for 14.0.0~pre3 release.

Comparison to 13.6.0: sdformat13_13.6.0...sdf14

Checklist

• Asked team if this is a good time for a release
• There are no changes to be ported from the previous major version
• No PRs targeted at this major version are close to getting in
• Bumped minor for new features, patch for bug fixes
• Updated changelog
• Updated migration guide (as needed)
• Link to PR updating dependency versions in appropriate repository in gazebo-release (as needed):

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1331 (60e3377) into sdf14 (eee6f5a) will not change coverage.
The diff coverage is n/a.

❗ Current head 60e3377 differs from pull request most recent head 294fbbf. Consider uploading reports for the commit 294fbbf to get more accurate results

@@           Coverage Diff           @@
##            sdf14    #1331   +/-   ##
=======================================
  Coverage   87.49%   87.49%           
=======================================
  Files         134      134           
  Lines       17759    17759           
=======================================
  Hits        15538    15538           
  Misses       2221     2221           

[scpeters]

do we want to wait for #1325 and/or #1330?

[azeey]

do we want to wait for #1325 and/or #1330?

Okay, let's wait for #1325.