gh-127359: Pin Tcl/Tk to 8 (8.6) for testing macOS (#127365)

diff --git a/.github/workflows/reusable-macos.yml b/.github/workflows/reusable-macos.yml
index 915481d0737c7dd21a0aea2b9bb6ba609a1e0d44..4c3dd10194f8cb68ec01beddef6f8c1c64208e90 100644 (file)
--- a/.github/workflows/reusable-macos.yml
+++ b/.github/workflows/reusable-macos.yml
@@ -37,7 +37,10 @@ jobs:
         path: config.cache
         key: ${{ github.job }}-${{ inputs.os }}-${{ env.IMAGE_VERSION }}-${{ inputs.config_hash }}
     - name: Install Homebrew dependencies
-      run: brew install pkg-config openssl@3.0 xz gdbm tcl-tk make
+      run: |
+        brew install pkg-config openssl@3.0 xz gdbm tcl-tk@8 make
+        # Because alternate versions are not symlinked into place by default:
+        brew link tcl-tk@8
     - name: Configure CPython
       run: |
         GDBM_CFLAGS="-I$(brew --prefix gdbm)/include" \