Bump actions/checkout from 3.5.3 to 4.0.0 (#287)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.5.3 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@c85c95e...3df4ab1)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/draft.yml

@@ -16,7 +16,7 @@ jobs:
         cache: pip
 
     - name: Clone
-      uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
     - name: Build specification
       run: |
@@ -25,7 +25,7 @@ jobs:
         make -f ../Makefile draft
 
     - name: Switch branch
-      uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
       with:
         ref: gh-pages
         clean: false

.github/workflows/pr.yml

@@ -9,7 +9,7 @@ jobs:
     name: Sanity checks before a PR merge
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
         with:
           fetch-depth: 0 # we want all refs for the --is-ancestor check
 

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
       contents: write # required to publish (tag) a release 
     steps:
     - name: Clone main
-      uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
       with:
         fetch-depth: 0
 
@@ -53,7 +53,7 @@ jobs:
 
     - name: Switch branch
       if: steps.getver.outputs.spec_version != steps.prevver.outputs.prev_version
-      uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+      uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
       with:
         ref: gh-pages
         clean: false