Update CI target OSes

Remove platforms deprecated by GitHub Actions
Add new platforms supported by the same

.github/workflows/create-release-artifacts.yaml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   windows:
-    runs-on: windows-2019
+    runs-on: windows-2022
     steps:
       - uses: actions/checkout@v2
       - name: Get version from tag

.github/workflows/create-release-docs.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   build:
     if: github.repository_owner == 'gbdev'
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout rgbds@release
         uses: actions/checkout@v2
@@ -18,17 +18,10 @@ jobs:
         with:
           repository: ${{ github.repository_owner }}/rgbds-www
           path: rgbds-www
-      # `-O toc` was added in 1.14.5, but the repos only have 1.14.4
-      - name: Build and install mandoc + install groff
+      - name: Install groff and mandoc
         run: |
           sudo apt-get -qq update
-          sudo apt-get install -yq groff zlib1g-dev
-          wget 'http://mandoc.bsd.lv/snapshots/mandoc-1.14.6.tar.gz'
-          tar xf mandoc-1.14.6.tar.gz
-          cd mandoc-1.14.6
-          ./configure
-          make
-          sudo make install
+          sudo apt-get install -yq groff mandoc
       - name: Update pages
         working-directory: rgbds/man
         run: | # The ref appears to be in the format "refs/tags/<version>", so strip that

.github/workflows/testing.yml

@@ -7,7 +7,7 @@ jobs:
   unix-testing:
     strategy:
       matrix:
-        os: [ubuntu-20.04, ubuntu-18.04, macos-11.0, macos-10.15]
+        os: [ubuntu-20.04, ubuntu-22.04, macos-11, macos-12]
         cc: [gcc, clang]
         buildsys: [make, cmake]
         exclude:
@@ -64,6 +64,7 @@ jobs:
     strategy:
       matrix:
         bits: [32, 64]
+        os: [windows-2019, windows-2022]
         include:
           - bits: 32
             arch: x86
@@ -72,7 +73,7 @@ jobs:
             arch: x86_x64
             platform: x64
       fail-fast: false
-    runs-on: windows-2019
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
       - name: Get zlib, libpng and bison
@@ -149,7 +150,6 @@ jobs:
     strategy:
       matrix:
         bits: [32, 64]
-        os: [ubuntu-18.04]
         include:
           - bits: 32
             arch: i686
@@ -158,7 +158,7 @@ jobs:
             arch: x86-64
             triplet: x86_64-w64-mingw32
       fail-fast: false
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     env:
       DIST_DIR: win${{ matrix.bits }}
     steps:
@@ -205,9 +205,10 @@ jobs:
     needs: windows-xbuild
     strategy:
       matrix:
+        os: [windows-2019, windows-2022]
         bits: [32, 64]
       fail-fast: false
-    runs-on: windows-2019
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
       - name: Retrieve binaries

.github/workflows/update-master-docs.yml

@@ -17,7 +17,7 @@ on:
 jobs:
   build:
     if: github.repository_owner == 'gbdev'
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout rgbds@master
         uses: actions/checkout@v2
@@ -31,16 +31,10 @@ jobs:
           repository: gbdev/rgbds-www
           ref: master
           path: rgbds-www
-      - name: Build and install mandoc + install groff
+      - name: Install groff and mandoc
         run: |
           sudo apt-get -qq update
-          sudo apt-get install -yq groff zlib1g-dev
-          wget 'http://mandoc.bsd.lv/snapshots/mandoc-1.14.6.tar.gz'
-          tar xf mandoc-1.14.6.tar.gz
-          cd mandoc-1.14.6
-          ./configure
-          make
-          sudo make install
+          sudo apt-get install -yq groff mandoc
       - name: Update pages
         working-directory: rgbds/man
         run: |