Upgrade GeoNode to Ubuntu 26.04 LTS

[mattiagiupponi]

Checklist

Reviewing is a process done by project maintainers, mostly on a volunteer basis. We try to keep the overhead as small as possible and appreciate if you help us to do so by completing the following items. Feel free to ask in a comment if you have troubles with any of them.

For all pull requests:

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• Make sure the first PR targets the master branch, eventual backports will be managed later. This can be ignored if the PR is fixing an issue that only happens in a specific branch, but not in newer ones.

The following are required only for core and extension modules (they are welcomed, but not required, for contrib modules):

• There is a ticket in https://github.com/GeoNode/geonode/issues describing the issue/improvement/feature (a notable exemption is, changes not visible to end-users)
• The issue connected to the PR must have Labels and Milestone assigned
• PR for bug fixes and small new features are presented as a single commit
• PR title must be in the form "[Fixes #<issue_number>] Title of the PR"
• New unit tests have been added covering the changes, unless there is an explanation on why the tests are not necessary/implemented

Submitting the PR does not require you to check all items, but by the time it gets merged, they should be either satisfied or inapplicable.

[gemini-code-assist]

Code Review

This pull request upgrades the base Docker images to Ubuntu 26.04, updates PostgreSQL and GDAL dependencies (upgrading GDAL to 3.12.2), and replaces the pylibmc memcached backend with pymemcache. Additionally, it adds application/octet-stream to the allowed MIME types for KML, 3D Tiles, and XLSX uploads. A review comment suggests safely checking if the OGR driver is available before accessing its ShortName property to prevent potential AttributeError exceptions.

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[codecov]

Codecov Report

❌ Patch coverage is 52.94118% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.91%. Comparing base (be64508) to head (89efebf).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #14329       +/-   ##
===========================================
+ Coverage   34.71%   65.91%   +31.20%     
===========================================
  Files         982      982               
  Lines       60496    60528       +32     
  Branches     8247     8251        +4     
===========================================
+ Hits        21002    39899    +18897     
+ Misses      38332    18950    -19382     
- Partials     1162     1679      +517     

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