Update charm libraries

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Automated action to fetch latest version of charm libraries. The branch of this PR
will be wiped during the next check. Unless you really know what you're doing, you
most likely don't want to push any commits to this branch.

[github-actions]

Test coverage for ab4a253

Name                            Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------------------
src/actions/__init__.py             3      0      0      0   100%
src/actions/register_user.py       21      0      2      0   100%
src/actions/reset_instance.py      21      3      2      1    83%   54-58
src/charm.py                      107      4     14      1    96%   112-113, 165-166
src/charm_state.py                 52      1     12      1    97%   121
src/charm_types.py                 11      0      0      0   100%
src/database_client.py             53      1     10      3    94%   35, 47->exit, 69->exit
src/database_observer.py           54      4      6      0    93%   70-72, 88
src/exceptions.py                   4      0      0      0   100%
src/mjolnir.py                    103      2     26      4    95%   68, 80->exit, 116, 181->186
src/observability.py                9      0      0      0   100%
src/pebble.py                      75      9      4      2    86%   90-91, 93, 107-112
src/saml_observer.py               45      1      8      0    98%   64
src/synapse/__init__.py             3      0      0      0   100%
src/synapse/api.py                161      5     20      2    96%   144, 315, 399-401
src/synapse/workload.py           187      6     26      6    94%   343-344, 360, 390->393, 409->412, 458, 460, 465
src/user.py                        24      0      4      0   100%
---------------------------------------------------------------------------
TOTAL                             933     36    134     20    95%

Static code analysis report

Run started:2023-10-18 09:09:54.031408

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 4527
  Total lines skipped (#nosec): 7
  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):