chore(deps): update actions/checkout action to v4 (#104)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://github.com/actions/checkout) | action |
major | `v3` -> `v4` |

---

### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

###
[`v4`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v400)

[Compare Source](https://github.com/actions/checkout/compare/v3...v4)

- [Support fetching without the --progress
option](https://github.com/actions/checkout/pull/1067)
-   [Update to node20](https://github.com/actions/checkout/pull/1436)

</details>

---

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Automerge - At any time (no schedule defined).

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rebase/retry checkbox.

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---

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.github/workflows/pr-checks.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           github_token: ${{ github.token }}
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       # Lint your Protobuf sources
       - uses: bufbuild/buf-lint-action@v1
         with:
@@ -32,7 +32,7 @@ jobs:
         with:
           github_token: ${{ github.token }}
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Buf format check
         run: buf format -d --exit-code
 

.github/workflows/release-please.yaml

@@ -37,7 +37,7 @@ jobs:
     if: ${{ needs.release-please.outputs.releases_created && needs.release-please.outputs.buf_release_tag }}
     steps:
       # Run `git checkout`
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ needs.release-please.outputs.buf_release_tag }}
       # Install the `buf` CLI
@@ -53,7 +53,7 @@ jobs:
     if: ${{ needs.release-please.outputs.releases_created && needs.release-please.outputs.json_release_tag }}
     steps:
       # Run `git checkout`
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ needs.release-please.outputs.json_release_tag }}
       - uses: JasonEtco/create-an-issue@v2