chore(deps): update peaceiris/workflows action to v0.21.0 (#117)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [peaceiris/workflows](https://redirect.github.com/peaceiris/workflows)
| action | minor | `v0.20.1` -> `v0.21.0` |

---

### Release Notes

<details>
<summary>peaceiris/workflows (peaceiris/workflows)</summary>

###
[`v0.21.0`](https://redirect.github.com/peaceiris/workflows/releases/tag/v0.21.0):
peaceiris/workflows v0.21.0

[Compare
Source](https://redirect.github.com/peaceiris/workflows/compare/v0.20.1...v0.21.0)

<!-- Release notes generated using configuration in .github/release.yml
at main -->

#### What's Changed

- feat: add setup-ko by
[@&#8203;peaceiris](https://redirect.github.com/peaceiris) in
[https://github.com/peaceiris/workflows/pull/847](https://redirect.github.com/peaceiris/workflows/pull/847)

**Full Changelog**:
peaceiris/workflows@v0.20.1...v0.21.0

</details>

---

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.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v3
 
       # https://github.com/peaceiris/workflows/blob/main/setup-go/action.yml
-      - uses: peaceiris/workflows/setup-go@v0.20.1
+      - uses: peaceiris/workflows/setup-go@v0.21.0
         with:
           go-version: '${{ env.GO_VERSION }}'
 
@@ -54,7 +54,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: peaceiris/workflows/setup-go@v0.20.1
+      - uses: peaceiris/workflows/setup-go@v0.21.0
         with:
           go-version: '${{ env.GO_VERSION }}'