Run CI on GDAL 3.7.3

[lnicola]

• [x] I agree to follow the project's code of conduct.

• [x] I added an entry to CHANGES.md if knowledge of this change could be valuable to users.

[lnicola]

r? @metasim

[metasim]

bors r+

[lnicola]

bors retry

[bors[bot]]

Build succeeded!

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• ci gdal-3.1.3
• ci gdal-3.2.3
• ci gdal-3.3.3
• ci gdal-3.4.3
• ci gdal-3.5.3
• ci gdal-3.6.4
• ci gdal-3.7.3
• ci ubuntu-lts