Bump actions/checkout to v4

Author: mat007

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
   Formatting:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Formatting
       uses: DoozyX/[email protected]
       with:
@@ -74,7 +74,7 @@ jobs:
             apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y g++ git cmake
             git config --global pack.threads 0
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           # For coverage builds fetch the whole history, else only 1 commit using a 'fake ternary'
           fetch-depth: ${{ matrix.coverage && '0' || '1' }}
@@ -86,7 +86,7 @@ jobs:
           path: boost-root
           key: boost-${{matrix.boostBranch}}
       - name: Checkout Boost
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: boostorg/boost
           ref: ${{matrix.boostBranch}}

.github/workflows/release.yml

@@ -17,8 +17,8 @@ jobs:
       BOOST_VERSION: 1.71.0
       BOOST_ROOT: ${{github.workspace}}/dependencies/boost
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+      - uses: actions/checkout@v4
         with:
           repository: boostorg/boost
           ref: boost-${{env.BOOST_VERSION}}