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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Configuration

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[github-actions[bot]]

Test coverage for e28bea3596a2f50812025b38b0a4d653a72edfcc

Name           Stmts   Miss Branch BrPart  Cover   Missing
----------------------------------------------------------
src/charm.py     191      0     68      1    99%   307->310
----------------------------------------------------------
TOTAL            191      0     68      1    99%

Static code analysis report

Run started:2023-10-25 03:52:41.727476

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 1122
    Total lines skipped (#nosec): 0
    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):