fix: release-please manifest

[m1sk9]

Details of implementation (実施内容)

release-please はこの値を見ているようなので, 空のままだと v1.0.0 のリリースという判定になってしまうようです.

[cloudflare-workers-and-pages[bot]]

Deploying with    Cloudflare Pages

Latest commit:	aeece1d
Status:	✅  Deploy successful!
Preview URL:	https://4209ebf0.oreorebot2.pages.dev
Branch Preview URL:	https://fix-release-please-manifest.oreorebot2.pages.dev

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (47a4139) 72.57% compared to head (aeece1d) 72.57%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1201 +/- ## ======================================= Coverage 72.57% 72.57% ======================================= Files 80 80 Lines 5484 5484 Branches 487 487 ======================================= Hits 3980 3980 Misses 1018 1018 Partials 486 486 ``` | [Flag](https://app.codecov.io/gh/approvers/OreOreBot2/pull/1201/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=approvers) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/approvers/OreOreBot2/pull/1201/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=approvers) | `72.57% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=approvers#carryforward-flags-in-the-pull-request-comment) to find out more.

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