Bump versions to safe floor

.github/workflows/test-compile.yml

@@ -44,8 +44,8 @@ jobs:
           - ubuntu-latest
         compiler:
           # oldest supported
-          - 'clang-10'
-          - 'gcc-10'
+          - 'clang-14'
+          - 'gcc-11'
           # newest, make sure to update maximum standard step to match
           - 'clang-19'
           - 'gcc-14'
@@ -74,7 +74,7 @@ jobs:
         uses: aminya/setup-cpp@v1
         with:
           compiler: ${{ matrix.compiler }}
-          gcc: ${{ (matrix.os == 'ubuntu-latest' && matrix.compiler == 'clang-10') && '10' || '' }}
+          gcc: ${{ (matrix.os == 'ubuntu-latest' && matrix.compiler == 'clang-14') && '12' || '' }}
 
       - name: Tool versions
         shell: bash
@@ -82,10 +82,10 @@ jobs:
           $CC --version
           $CXX --version
 
-      - name: Fix clang-10 toolchain
-        if: matrix.os == 'ubuntu-latest' && matrix.compiler == 'clang-10'
+      - name: Fix clang-14 toolchain
+        if: matrix.os == 'ubuntu-latest' && matrix.compiler == 'clang-14'
         run: |
-          echo "CXXFLAGS=--gcc-toolchain=/usr" >> $GITHUB_ENV
+          echo 'CXXFLAGS=--gcc-toolchain=/usr -isystem /usr/include/c++/12 -isystem /usr/include/x86_64-linux-gnu/c++/12' >> $GITHUB_ENV
 
       # minimum standard
       - name: Build C++20