GH Actions: Move step to get vcpkg commit where it is needed

Moving this closer to where it is used makes the workflow easier
to read.

Signed-off-by: Be <be@mixxx.org>
Signed-off-by: Panagiotis Vasilopoulos <hello@alwayslivid.com>
Reference-to: https://github.com/tenacityteam/tenacity/pull/592

.github/workflows/cmake_build.yml

@@ -88,9 +88,6 @@ jobs:
       with:
         submodules: true
 
-    - name: Get Git commit of vcpkg submodule
-      run: echo VCPKG_COMMIT=$(git ls-tree HEAD vcpkg | awk '{print $3}') >> ${GITHUB_ENV}
-
     - name: Setup platform specific environmental variables
       run: |
         if [[ "${{runner.os}}" == "Windows" ]]; then
@@ -193,6 +190,9 @@ jobs:
         iwr -useb get.scoop.sh | iex
         scoop install sccache
 
+    - name: Get Git commit of vcpkg submodule
+      run: echo VCPKG_COMMIT=$(git ls-tree HEAD vcpkg | awk '{print $3}') >> ${GITHUB_ENV}
+
     # Cache the vcpkg cache and the vcpkg executable to avoid bootstrapping each time
     - name: Setup vcpkg cache
       uses: actions/cache@v2