ci: bump checkout to v4

.github/workflows/alpine_builds.yml

@@ -17,7 +17,7 @@ jobs:
         apk add autoconf automake bash build-base clang clang-analyzer git \
           libfido2-dev libtool linux-pam-dev openssl-dev pkgconfig
     - name: checkout pam-u2f
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: mark workspace as safe
       run: git config --global --add safe.directory "${GITHUB_WORKSPACE}"
     - name: build

.github/workflows/codeql-analysis.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/format.yml

@@ -8,7 +8,7 @@ jobs:
     env:
       CLANG_FORMAT_VERSION: -15
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Dependencies

.github/workflows/linux_builds.yml

@@ -14,7 +14,7 @@ jobs:
           - { os: ubuntu-20.04, cc: gcc-10 }
           - { os: ubuntu-20.04, cc: clang-11 }
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: dependencies
       env:
         CC: ${{ matrix.cc }}

.github/workflows/linux_fuzz.yml

@@ -12,7 +12,7 @@ jobs:
         cc: [clang-15]
         sanitizer: [asan]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Dependencies
       env:
         CC: ${{ matrix.cc }}

.github/workflows/macos_builds.yml

@@ -11,7 +11,7 @@ jobs:
         os: [ macos-11, macos-12, macos-13 ]
         cc: [ clang ]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: dependencies
       run: brew install check cmake help2man libfido2 mandoc pkg-config automake
     - name: build