(Closes #3364) Prepare for release 3.3.0

[arporter]

Just updates the version number in the two locations.
At merge time we'll need to update the changelog too.
As the 'update to fparser 0.2.4' has just gone on, we know that all of the fparser settings in the various workflow files are correct already.

[arporter]

Ready for review (@hiker or @sergisiso) and for final testing at the Met Office (@andrewcoughtrie). Sergi tells me that he's also brought the associated lfric_apps PR up-to-date: MetOffice/lfric_apps#545

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4216b9a) to head (0a4f081).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #3470   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          395       395           
  Lines        55199     55199           
=========================================
  Hits         55199     55199           

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[sergisiso]

@arporter Since this cycle we moved to pyproject so I attempted the build manually and everything worked, but it has the same warning that we fixed in fparser:

SetuptoolsDeprecationWarning: `project.license` as a TOML table is deprecated
!!

        ********************************************************************************
        Please use a simple string containing a SPDX expression for `project.license`. You can also use `project.license-files`. (Both options available on setuptools>=77.0.0).

        By 2027-Feb-18, you need to update your project and remove deprecated calls
        or your builds will no longer be supported.

        See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
        ********************************************************************************

Could you fix it here as well please?

[arporter]

License string updated (GH wouldn't let me respond to the comment directly) and I've pushed the changes.
Ready for another look/to hear back from the MO.

[sergisiso]

@arporter All good now, just waiting for the green light from the MO.