chore(deps): update ubuntu:22.04 docker digest to a6d2b38

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
ubuntu	digest	6d7b5d3 -> a6d2b38

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Configuration

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[github-actions[bot]]

Test coverage for ad62e4b7e5ac746d5581ed82b9bd4ba18c721117

Name              Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------
src/charm.py        321     27     78     12    90%   186, 194-195, 207, 335->343, 376->381, 393, 575-577, 582-583, 595-597, 602-603, 615-617, 640-642, 684->exit, 694->exit, 724-730, 756->exit, 770-771, 781->exit, 795
src/database.py      30      1      8      1    95%   56
-------------------------------------------------------------
TOTAL               351     28     86     13    91%

Static code analysis report

Run started:2024-05-03 07:56:18.232753

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 2047
    Total lines skipped (#nosec): 3
    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):