Update Swatinem/rust-cache action to v2.7.3 (#1212)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
 
-      - uses: Swatinem/rust-cache@a22603398250b864f7190077025cf752307154dc # v2.7.2
+      - uses: Swatinem/rust-cache@23bce251a8cd2ffc3c1075eaa2367cf899916d84 # v2.7.3
 
       - run: cargo run
       - run: cp CNAME ./site/