GitHub Actions: Fix warnings

Author: jhasse

.github/workflows/android.yml

@@ -10,7 +10,7 @@ jobs:
     container:
       image: registry.gitlab.com/jhasse/android-ndk-docker:r28b
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Cache CPM.cmake packages
       uses: actions/cache@v4
       with:

.github/workflows/gh-pages.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - name: Install dependencies
         run: microdnf install -y git graphviz doxygen cmake make tar xz rsync texlive-latex texlive-newunicodechar texlive-dvips pdf2svg ghostscript
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - name: Build

.github/workflows/ios.yml

@@ -4,7 +4,7 @@ jobs:
   build:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Cache CPM.cmake packages
       uses: actions/cache@v4
       with:

.github/workflows/linux.yml

@@ -4,7 +4,7 @@ jobs:
   build:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Basic linting
       run: .github/ci.py
     - name: Install dependencies

.github/workflows/macos.yml

@@ -4,10 +4,10 @@ jobs:
   build:
     runs-on: macos-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Install dependencies
       run: |
-        brew install sdl2 libvorbis webp ninja
+        brew install sdl2 libvorbis webp
     - name: Build with CMake
       run: |
         cmake -Bbuild-cmake -GNinja

.github/workflows/windows.yml

@@ -4,7 +4,7 @@ jobs:
   clang-cl:
     runs-on: windows-2025
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Cache CPM.cmake packages
       uses: actions/cache@v4
       with:
@@ -29,7 +29,7 @@ jobs:
   msvc:
     runs-on: windows-2025
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Cache CPM.cmake packages
       uses: actions/cache@v4
       with:
@@ -57,7 +57,7 @@ jobs:
     steps:
     - name: Install dependencies
       run: microdnf install -y cmake ninja-build mingw64-pkg-config mingw64-libvorbis mingw64-SDL2 mingw64-fontconfig mingw64-libwebp mingw64-dlfcn mingw32-nsis mingw64-gcc-c++ tar gzip
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Build with CMake and GCC
       run: |
         mingw64-cmake -Bbuild-windows -DCMAKE_BUILD_TYPE=Debug -DBUILD_SHARED_LIBS=0