Update .github/workflows/e2e-cache.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: clintval

.github/workflows/e2e-cache.yml

@@ -240,8 +240,8 @@ jobs:
       - name: Check files to cache on windows-latest
         if: matrix.os == 'windows-latest'
         run: |
-          if [ ! -d %USER/.cache/mill/download ]; then
-            echo "::error::The %USER/.cache/mill/download directory does not exist unexpectedly"
+          if [ ! -d %USERPROFILE%/.cache/mill/download ]; then
+            echo "::error::The %USERPROFILE%/.cache/mill/download directory does not exist unexpectedly"
             exit 1
           fi
       - name: Check files to cache on ubuntu-latest