chore(deps): update dependency jsonschema to v4.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
jsonschema (changelog)	==4.20.0 -> ==4.21.0

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Release Notes

python-jsonschema/jsonschema (jsonschema)

v4.21.0

Compare Source

=======

• Fix the behavior of enum in the presence of 0 or 1 to properly consider True and False unequal (#​1208).
• Special case the error message for {min,max}{Items,Length,Properties} when they're checking for emptiness rather than true length.

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Test coverage for b75c1ab

Name                             Stmts   Miss Branch BrPart  Cover   Missing
----------------------------------------------------------------------------
src/charm.py                        53      3      4      1    93%   98-100
src/charm_state.py                  36      1      8      1    95%   21
src/constants.py                     5      0      0      0   100%
src/exceptions.py                    4      0      0      0   100%
src/github_actions_exporter.py      24      0      0      0   100%
----------------------------------------------------------------------------
TOTAL                              122      4     12      2    96%

Static code analysis report

Run started:2024-01-17 06:06:14.322224

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 587
  Total lines skipped (#nosec): 0
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):