chore(deps): update dependency ops to v2.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ops	==2.7.0 -> ==2.8.0

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Release Notes

canonical/operator (ops)

v2.8.0

Compare Source

• Added Unit.reboot() and `Harness.reboot_count``
• Added RelationMeta.optional
• The type of a Handle's key was expanded from str to str|None
• Narrowed types of app and unit in relation events to exclude None where applicable

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Test coverage for ec0c95d

Name                Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------
src/charm.py          517     37    168     29    90%   188-191, 542, 573, 619, 654-655, 706-713, 718, 820->825, 824, 826, 831-832, 892, 910, 917, 1009, 1018, 1030, 1051, 1060, 1079, 1083, 1112, 1165, 1297, 1319, 1326->1328, 1371->exit, 1383, 1415, 1424-1425
src/cos.py             15      0      0      0   100%
src/exceptions.py      17      1      2      1    89%   41
src/types_.py          15      0      0      0   100%
---------------------------------------------------------------
TOTAL                 564     38    170     30    90%

Static code analysis report

Run started:2023-10-25 10:00:21.326113

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 4243
  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):