[3.13] Run apt update before apt install git in autoconf CI job (GH-127070)

(cherry picked from commit 0af4ec3)

Co-authored-by: Zachary Ware <zach@python.org>

Author: miss-islington

.github/workflows/build.yml

@@ -96,7 +96,7 @@ jobs:
     steps:
       - name: Install Git
         run: |
-          apt install git -yq
+          apt update && apt install git -yq
           git config --global --add safe.directory "$GITHUB_WORKSPACE"
       - uses: actions/checkout@v4
         with: