limit windows builds to Rust 1.77 (to keep Windows 7 support)

Author: davidhewitt

.github/workflows/ci.yml

@@ -486,7 +486,9 @@ jobs:
           target: ${{ matrix.target }}
           manylinux: ${{ matrix.manylinux }}
           args: --release --out dist --interpreter ${{ matrix.interpreter || '3.8 3.9 3.10 3.11 3.12 3.13 pypy3.9 pypy3.10' }}
-          rust-toolchain: stable
+          # Limit windows builds to 1.77 to keep Windows 7 support.
+          # FIXME: Unpin when Python 3.8 support is dropped. (3.9 requires Windows 10)
+          rust-toolchain: ${{ (matrix.os == 'windows' && '1.77') || 'stable' }}
           docker-options: -e CI
 
       - run: ${{ (matrix.os == 'windows' && 'dir') || 'ls -lh' }} dist/
@@ -544,8 +546,6 @@ jobs:
       # generate self-schema now, so we don't have to do so inside docker in maturin build
       - run: python generate_self_schema.py
 
-      - run: rustc --version --verbose
-
       - name: build initial wheel
         uses: PyO3/maturin-action@v1
         with:
@@ -554,7 +554,9 @@ jobs:
             --release
             --out pgo-wheel
             --interpreter ${{ matrix.interpreter }}
-          rust-toolchain: stable
+          # Limit windows builds to 1.77 to keep Windows 7 support.
+          # FIXME: Unpin when Python 3.8 support is dropped. (3.9 requires Windows 10)
+          rust-toolchain: ${{ (matrix.os == 'windows' && '1.77') || 'stable' }}
           docker-options: -e CI
         env:
           RUSTFLAGS: "-Cprofile-generate=${{ github.workspace }}/profdata"
@@ -582,7 +584,9 @@ jobs:
             --release
             --out dist
             --interpreter ${{ matrix.interpreter }}
-          rust-toolchain: stable
+          # Limit windows builds to 1.77 to keep Windows 7 support.
+          # FIXME: Unpin when Python 3.8 support is dropped. (3.9 requires Windows 10)
+          rust-toolchain: ${{ (matrix.os == 'windows' && '1.77') || 'stable' }}
           docker-options: -e CI
         env:
           RUSTFLAGS: "-Cprofile-use=${{ github.workspace }}/merged.profdata"