chore(deps): update ubuntu:22.04 docker digest to e6173d4

[renovate]

This PR contains the following updates:

Package	Update	Change
ubuntu	digest	6042500 -> e6173d4

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[github-actions]

Test coverage for 17f13ed

Name              Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------
src/charm.py        328     30     82     11    90%   177, 185-186, 342->347, 540-542, 547-548, 559-561, 566-567, 579-581, 586-587, 599-601, 626-628, 668->exit, 678->exit, 708-714, 740->exit, 754-755, 765->exit, 779
src/database.py      30      1      8      1    95%   56
-------------------------------------------------------------
TOTAL               358     31     90     12    90%

Static code analysis report

Run started:2024-01-17 13:30:05.685971

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 1978
  Total lines skipped (#nosec): 1
  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):