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

[renovate[bot]]

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`](https://togithub.com/canonical/operator/blob/HEAD/CHANGES.md#280) [Compare Source](https://togithub.com/canonical/operator/compare/2.7.0...2.8.0) - 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 ec0c95dca2e8632caf9f6e7cfd1005baaeae80b6

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):