Update CI action versions

Author: jimporter

.github/workflows/build.yml

@@ -70,7 +70,7 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Cache Boost binaries
         if: startsWith(matrix.os, 'windows-') && matrix.boost-version
         uses: actions/cache@v3
@@ -81,7 +81,7 @@ jobs:
             ${{ matrix.os }}-boost-${{ matrix.boost-version }}-msvc-${{
             matrix.version }}-${{ hashFiles('.github/workflows/build.yml') }}
       - name: Set up Python 3.10
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: '3.10'
       - name: Install Python dependencies
@@ -159,7 +159,7 @@ jobs:
         with:
           toolset: ${{ matrix.version }}
       - name: Clone mettle
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: jimporter/mettle
           path: mettle