Update linux runner (#455)

.github/workflows/ci-build.yml

@@ -125,7 +125,7 @@ jobs:
   linux:
     name: Linux (${{ matrix.arch }})
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     strategy:
       fail-fast: false
@@ -143,7 +143,6 @@ jobs:
         run: |
           sudo dpkg --add-architecture i386
           sudo apt update
-          sudo apt install --allow-downgrades libpcre2-8-0=10.34-7
           sudo apt install g++-multilib libsdl2-dev:i386 zlib1g-dev:i386
 
       - name: Dependencies (x64)
@@ -156,7 +155,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: out
-          key: linux-${{ matrix.arch }}-cmake-v2
+          key: linux-${{ matrix.arch }}-cmake-v3
 
       - name: Configure
         run: |