Update actions/cache to v4 (#2524)

Author: brucemiller

.github/workflows/windows.yml

@@ -51,7 +51,7 @@ jobs:
       # ====================
 
       - name: Setup Strawberry Perl Cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         id: perl-cache
         with:
           path: C:\Strawberry
@@ -70,7 +70,7 @@ jobs:
 
       - name: Setup MiKTeX Repository Cache
         if: matrix.miktex != 'none'
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         id: miktex-cache
         with:
           path: 'C:\miktex-repo'