Update cache version to unbreak CI

(cherry picked from commit a062a48, PR #544)

Author: LilithHafner

JuliaSyntax/.github/workflows/CI.yml

@@ -92,7 +92,7 @@ jobs:
         with:
           version: 1.6
           arch: x64
-      - uses: actions/cache@v1
+      - uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
         with: