Clarify GDAL version requirement

[cottsay]

🦟 Bug fix

Summary

The default behavior of pkg-config seems to be an exact version match.

This was discovered when the RPM build process automatically added package dependencies based on the *.pc files generated by the project, one of which contained gdal = 3.0. This bug can be confirmed on any distro that has a gdal version other than 3.0, such as Ubuntu Jammy:

$ pkg-config --cflags gz-common5-geospatial
Package 'gz-common5-geospatial' requires 'gdal = 3.0' but version of gdal is 3.4.1
$ echo $?
1

It's interesting that the version comparison behaves differently in the first dependency level (which did not produce an error) than it does in subsequent levels. Perhaps there is a bug in gz-cmake as well.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0b8428a) 83.65% compared to head (f6372e4) 83.65%.

Additional details and impacted files

@@             Coverage Diff             @@
##           gz-common5     #574   +/-   ##
===========================================
  Coverage       83.65%   83.65%           
===========================================
  Files              90       90           
  Lines           10273    10273           
===========================================
  Hits             8594     8594           
  Misses           1679     1679           

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