Update release procedure and script

[msimberg]

Pulls in many of the release script improvements that were made in DLA-Future.

• Adds checks for CITATION.cff
• Uses regexes instead of just the version number to check that the version is set correctly.
• Check for today's date in the changelog and CITATION.cff.

Also adds a note in the release procedure to update the CITATION.cff file.

I also did not update the CITATION.cff file for 0.30.0 and 0.30.1. I've updated the entries manually on zenodo.org, and updated the file here for 0.30.1.

I obviously haven't tested the updated release script on a full release, but testing until the tagging phase seems work to catch errors e.g. in the CITATION.cff file.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.01% (target: -1.00%)	✅ ∅ (target: 90.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (2e77f99)	18274	13796	75.50%
Head commit (2099dea)	18272 (-2)	13793 (-3)	75.49% (-0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1336)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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