Bump actions/cache from 4 to 5 (#21)

Author: dependabot[bot]

.github/workflows/rust.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
-    - uses: actions/cache@v4
+    - uses: actions/cache@v5
       with:
         path: |
           ~/.cargo/bin/
@@ -42,7 +42,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v6
-    - uses: actions/cache@v4
+    - uses: actions/cache@v5
       with:
         path: |
           ~/.cargo/bin/