[ci] Update GitHub Actions to latest major release

Fix warning that Node.js 20 is disconinued in June

.github/workflows/linux-bazel-builds.yml

@@ -16,10 +16,10 @@ jobs:
         compilation_mode: [fastbuild, dbg, opt]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Mount Bazel cache
-      uses: actions/cache@v3
+      uses: actions/cache@v5
       with:
         path: "/home/runner/.cache/bazel"
         key: bazel-ubuntu22-gcc11

.github/workflows/linux-meson-builds.yml

@@ -23,7 +23,7 @@ jobs:
             other_pkgs: clang-11
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Prepare environment
       run: |

.github/workflows/linux-other-builds.yml

@@ -75,7 +75,7 @@ jobs:
 
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Prepare environment
       run: |
@@ -100,7 +100,7 @@ jobs:
     name: clang-tidy
     runs-on: ubuntu-22.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Prepare environment
       run: |

.github/workflows/linux-simple-builds.yml

@@ -83,7 +83,7 @@ jobs:
             other_pkgs: g++-11
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Add repositories for older compilers
       run: |

.github/workflows/mac-builds.yml

@@ -17,7 +17,7 @@ jobs:
         std: [14, 17]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Configure
       run: |

.github/workflows/mac-sanitizer-builds.yml

@@ -25,7 +25,7 @@ jobs:
             filter:
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Configure
 

.github/workflows/package-manager-builds.yaml

@@ -18,7 +18,7 @@ jobs:
             profile_generate: 'false'
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     - name: Install conan
       run: pip install conan==${{matrix.conan_version}}

.github/workflows/validate-header-guards.yml

@@ -9,10 +9,10 @@ jobs:
     steps:
 
       - name: Checkout source code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Dependencies
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v6
         with:
             python-version: '3.7'
       - name: Install checkguard

.github/workflows/windows-simple-builds.yml

@@ -18,7 +18,7 @@ jobs:
         build_type: [Debug, Release]
         std: [14, 17]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Configure build
         run: |