chore(deps): update oven/bun docker tag to v1.1.21

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This PR contains the following updates:

Package	Type	Update	Change
oven/bun	stage	patch	1.1.20-slim -> 1.1.21-slim

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Release Notes

oven-sh/bun (oven/bun)

### [`v1.1.21`](https://togithub.com/oven-sh/bun/releases/tag/bun-v1.1.21): Bun v1.1.21 To install Bun v1.1.21: ```bash curl -fsSL https://bun.sh/install | bash ### or you can use npm ### npm install -g bun ``` Windows: ```bash powershell -c "irm bun.sh/install.ps1|iex" ``` To upgrade to Bun v1.1.21: ```bash bun upgrade ``` ##### **[Read Bun v1.1.21's release notes on Bun's blog](https://bun.sh/blog/bun-v1.1.21)**

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Configuration

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🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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