This reverts commit b1c4304475.

Revert "Try running in ubuntu:18.04 container under ubuntu-latest (to get GCC 7)"

This reverts commit b203a294bb.

.github/workflows/ci.yml

@@ -368,56 +368,6 @@ jobs:
       run: cmake --build build --target test_cmake_build
 
 
-  gcc7:
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        std:
-          - 11
-        python:
-          - '3.8'
-
-    name: "🐍 ${{ matrix.python }} • GCC 7 • C++${{ matrix.std }} • x64"
-    container: ubuntu:18.04
-
-    steps:
-    - uses: actions/checkout@v4
-
-    - name: Add GCC
-      run: apt-get update && apt-get install -y gcc
-
-    - name: Setup Python ${{ matrix.python }}
-      uses: actions/setup-python@v5
-      with:
-        python-version: ${{ matrix.python }}
-
-    - name: Prepare env
-      run: |
-        python -m pip install -r tests/requirements.txt
-
-    - name: Configure
-      shell: bash
-      run: >
-        cmake -S . -B build
-        -DPYBIND11_WERROR=ON
-        -DDOWNLOAD_CATCH=ON
-        -DCMAKE_CXX_STANDARD=${{ matrix.std }}
-        -DPYTHON_EXECUTABLE=$(python3 -c "import sys; print(sys.executable)")
-
-    - name: Build
-      run: cmake --build build -j 2
-
-    - name: Python tests
-      run: cmake --build build --target pytest
-
-    - name: C++ tests
-      run: cmake --build build --target cpptest
-
-    - name: Interface test
-      run: cmake --build build --target test_cmake_build
-
-
   # Testing NVCC; forces sources to behave like .cu files
   cuda:
     runs-on: ubuntu-latest