Update actions/cache action to v3

PR created by Renovate Bot.

.gitea/workflows/cache.yml

@@ -10,19 +10,19 @@ jobs:
     - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2
 
     - name: Cache cargo registry
-      uses: actions/cache@8492260343ad570701412c2f464a5877dc76bace # v2
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3
       with:
         path: ~/.cargo/registry
         key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
 
     - name: Cache cargo index
-      uses: actions/cache@8492260343ad570701412c2f464a5877dc76bace # v2
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3
       with:
         path: ~/.cargo/git
         key: ${{ runner.os }}-cargo-git-${{ hashFiles('**/Cargo.lock') }}
 
     - name: Cache cargo build
-      uses: actions/cache@8492260343ad570701412c2f464a5877dc76bace # v2
+      uses: actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84 # v3
       with:
         path: target
         key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}