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

[renovate]

This PR contains the following updates:

Package	Update	Change
ubuntu	digest	a2bbdf7 -> e6173d4

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Configuration

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[github-actions]

Test coverage for dbd397b

Name              Stmts   Miss Branch BrPart  Cover   Missing
-------------------------------------------------------------
src/charm.py        330     30     82     11    90%   177, 185-186, 350->355, 548-550, 555-556, 567-569, 574-575, 587-589, 594-595, 607-609, 634-636, 676->exit, 686->exit, 716-722, 748->exit, 762-763, 773->exit, 787
src/database.py      30      1      8      1    95%   56
-------------------------------------------------------------
TOTAL               360     31     90     12    90%

Static code analysis report

Run started:2024-01-18 12:25:12.240933

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 1984
  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):

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