fix: Fix bun version of base image

[MikuroXina]

Type of Change:

Dockerfile の修正

Dealing with Problems (問題への対処)

Bun が semver へ厳密に従っておらずロックファイルの生成結果が整合しなくなることがあった. ベースイメージのバージョンがメジャーバージョンのみだったが, この問題への対処としてバージョン指定をパッチまで固定した.

[github-actions[bot]]

Hadolint: success

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Deploying oreorebot2 with    Cloudflare Pages

Latest commit:	f5d6a98
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Branch Preview URL:	https://fix-bun-base.oreorebot2.pages.dev

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[codecov[bot]]

Codecov Report

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

Project coverage is 58.96%. Comparing base (89e8402) to head (f5d6a98).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1342 +/- ## ======================================= Coverage 58.96% 58.96% ======================================= Files 112 112 Lines 7323 7323 Branches 530 530 ======================================= Hits 4318 4318 Misses 2476 2476 Partials 529 529 ``` | [Flag](https://app.codecov.io/gh/approvers/OreOreBot2/pull/1342/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/1342/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=approvers) | `58.96% <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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