Remove Bionic from future releases (Garden+)

[chapulina]

• See Garden support gazebo-tooling/release-tools#597

Summary

ign-math7 will be on Garden.

Test it

No Bionic builds should be triggered.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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.

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[codecov]

Codecov Report

Merging #386 (c943d18) into main (0d05f47) will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #386      +/-   ##
==========================================
+ Coverage   99.64%   99.72%   +0.08%     
==========================================
  Files          65       65              
  Lines        6115     6120       +5     
==========================================
+ Hits         6093     6103      +10     
+ Misses         22       17       -5     

Impacted Files	Coverage Δ
include/ignition/math/Plane.hh	100.00% <0.00%> (ø)
include/ignition/math/Matrix4.hh	100.00% <0.00%> (ø)
include/ignition/math/Inertial.hh	100.00% <0.00%> (ø)
include/ignition/math/MassMatrix3.hh	99.39% <0.00%> (+<0.01%)	⬆️
include/ignition/math/Quaternion.hh	100.00% <0.00%> (+0.24%)	⬆️
include/ignition/math/Helpers.hh	100.00% <0.00%> (+0.69%)	⬆️
src/Helpers.cc	98.21% <0.00%> (+2.67%)	⬆️

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[chapulina]

I cancelled the Windows build because the buildfarm is swamped and this PR shouldn't affect it.

The Ubuntu Jenkins build is failing to get dependencies 🤔

The following packages have unmet dependencies:
 libignition-cmake2-dev : Breaks: libignition-cmake-dev (<= 2.10.0-2) but 0.6.1-1ubuntu1 is to be installed
E: Unable to correct problems, you have held broken packages.

[scpeters]

I cancelled the Windows build because the buildfarm is swamped and this PR shouldn't affect it.

The Ubuntu Jenkins build is failing to get dependencies 🤔

The following packages have unmet dependencies:
 libignition-cmake2-dev : Breaks: libignition-cmake-dev (<= 2.10.0-2) but 0.6.1-1ubuntu1 is to be installed
E: Unable to correct problems, you have held broken packages.

I think it could be a problem with that build machine?

• failed build https://build.osrfoundation.org/job/ignition_math-ci-pr_any-ubuntu_auto-amd64/1264/ ran on https://build.osrfoundation.org/computer/linux-drogon.nv.focal-4f37bbc3
• retrying https://build.osrfoundation.org/job/ignition_math-ci-pr_any-ubuntu_auto-amd64/1265/ on https://build.osrfoundation.org/computer/linux-optimus.nv.focal-b9b55ab5