Bump actions/checkout from 3 to 4 (#289)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
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>

.github/workflows/codeql.yml

@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v2

.github/workflows/integration-tests.yml

@@ -64,7 +64,7 @@ jobs:
     steps:
       - name: Check out slate-client-server repo
         if: ${{ github.event.inputs.slate-client-server-branch == '' }}
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
           path: ./slate-client-server
@@ -73,7 +73,7 @@ jobs:
 
       - name: Check out specific branch of slate-client-server repo
         if: ${{ github.event.inputs.slate-client-server-branch != '' }}
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
           path: ./slate-client-server
@@ -82,7 +82,7 @@ jobs:
 
       - name: Check out slate-portal repo
         if: ${{ github.event.inputs.slate-portal-branch == '' }}
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
           path: ./slate-portal
@@ -91,7 +91,7 @@ jobs:
 
       - name: Check out specific branch of slate-portal repo
         if: ${{ github.event.inputs.slate-portal-branch != '' }}
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
           path: ./slate-portal
@@ -161,7 +161,7 @@ jobs:
           echo "SLATE_PORTAL_ENDPOINT=$(minikube service slate-portal-local-service --url --namespace local)" >> $GITHUB_ENV
 
       - name: Check out portal-unit-test repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
           path: ./portal-unit-test

.github/workflows/pr-python.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Check out repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
           path: .