chore(deps): update actions/cache digest to 640a1c2

Author: renovate[bot]

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
           clj-kondo: latest
 
       - name: Cache clojure dependencies
-        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # tag: v4.2.3
+        uses: actions/cache@640a1c2554105b57832a23eea0b4672fc7a790d5 # tag: v4.2.3
         with:
           path: |
             ~/.m2/repository