Update actions/checkout action to v4 (#322)

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This PR contains the following updates:

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

---

### Release Notes

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

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

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

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

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **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.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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.github/workflows/flux-local-diff.yaml

@@ -28,7 +28,7 @@ jobs:
         - kustomization
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - uses: ./action/diff
       id: diff
       with:

.github/workflows/flux-local-test.yaml

@@ -23,7 +23,7 @@ jobs:
         - tests/testdata/cluster6
         - tests/testdata/cluster7
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: ./action/test
       with:
         enable-helm: true

.github/workflows/lint.yaml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: codespell-project/actions-codespell@master
     - name: Run yamllint
       uses: ibiqlik/action-yamllint@v3

.github/workflows/pages.yaml

@@ -33,7 +33,7 @@ jobs:
       matrix:
         python-version: ["3.10"]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:

.github/workflows/python-package.yaml

@@ -21,7 +21,7 @@ jobs:
         - "3.11"
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}

.github/workflows/python-publish.yaml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python
       uses: actions/setup-python@v4
       with:

action/diff/action.yml

@@ -60,11 +60,11 @@ runs:
         pip install -e ${{ github.action_path }}/../../
       shell: bash
     - name: Checkout PR branch
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         path: pr
     - name: Checkout live branch
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: ${{ inputs.live-branch }}
         path: live