chore(deps): update dependency cosl to v0.0.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cosl	==0.0.13 -> ==0.0.15

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[github-actions]

Test coverage for 38d7891

Name                Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------
src/actions.py         29      0      4      0   100%
src/agent.py          119      0     20      0   100%
src/auth_proxy.py      52      0      8      0   100%
src/charm.py           89      0     14      0   100%
src/cos.py             20      0      0      0   100%
src/ingress.py         16      0      4      0   100%
src/jenkins.py        376      0     60      0   100%
src/pebble.py          25      0      2      0   100%
src/state.py          109      0     24      0   100%
src/timerange.py       30      0      6      0   100%
---------------------------------------------------------------
TOTAL                 865      0    142      0   100%

Static code analysis report

Run started:2024-07-30 08:09:58.498287

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 7508
  Total lines skipped (#nosec): 6
  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):