Pin rust compiler version to 1.73 for wheel builds (#11267)

* Pin rust compiler version to 1.73 for wheel builds

With the release 1.74 on 11-16-2023 the minimum supported macOS version
by the Rust compiler is 10.12. For the 0.45.x release series we still
support macOS 10.9 (this will change in 1.0 see #10902). To faciliate
still publishing wheels that will support macOS 10.9 for any future
bugfix releases on 0.45.x release series (and 0.46.x too) this commit
pins the rust toolchain version we use to 1.73 which is the last
release that support 10.9.

* DNM: test wheel builds

* Add win32 target

* Only pin macOS version

* Fix syntax error

* Revert "DNM: test wheel builds"

This reverts commit 9cbd70f.

* Use stable on linux

.github/workflows/wheels.yml

@@ -20,6 +20,9 @@ jobs:
         with:
           python-version: '3.10'
       - uses: dtolnay/rust-toolchain@stable
+        if: runner.os != 'macOS'
+      - uses: dtolnay/[email protected]
+        if: runner.os == 'macOS'
       - name: Build wheels
         uses: pypa/[email protected]
       - uses: actions/upload-artifact@v3

pyproject.toml

@@ -26,6 +26,7 @@ repair-wheel-command = "auditwheel repair -w {dest_dir} {wheel} && pipx run abi3
 
 [tool.cibuildwheel.macos]
 repair-wheel-command = "delocate-wheel --require-archs {delocate_archs} -w {dest_dir} -v {wheel} && pipx run abi3audit --strict --report {wheel}"
+environment = 'RUSTUP_TOOLCHAIN="1.73"'
 
 [tool.cibuildwheel.windows]
 repair-wheel-command = "cp {wheel} {dest_dir}/. && pipx run abi3audit --strict --report {wheel}"