Bump actions/checkout from 4.1.2 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.2 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.2...v4.2.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build-images.yml

@@ -27,7 +27,7 @@ jobs:
       clojure_matrix: ${{ steps.set-matrix.outputs.clojure_matrix }}
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v4.1.2
+      - uses: actions/checkout@v4.2.1
         with:
           persist-credentials: false
 
@@ -67,7 +67,7 @@ jobs:
       - name: set PWD environment variable
         run: echo "PWD=$(pwd)" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v4.1.2
+      - uses: actions/checkout@v4.2.1
         with:
           persist-credentials: false
 
@@ -127,7 +127,7 @@ jobs:
       - name: set PWD environment variable
         run: echo "PWD=$(pwd)" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v4.1.2
+      - uses: actions/checkout@v4.2.1
         with:
           persist-credentials: false
 
@@ -187,7 +187,7 @@ jobs:
       - name: set PWD environment variable
         run: echo "PWD=$(pwd)" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v4.1.2
+      - uses: actions/checkout@v4.2.1
         with:
           persist-credentials: false
 

.github/workflows/techdocs.yaml

@@ -12,7 +12,7 @@ jobs:
   publish-techdocs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.1.2
+      - uses: actions/checkout@v4.2.1
 
       - uses: actions/setup-node@v4.0.2