fix: [#428] correct prometheus tag in docker_image test and workflow action policy

Author: josecelano

.github/workflows/docker-security-scan.yml

@@ -101,15 +101,18 @@ jobs:
     timeout-minutes: 10
     outputs:
       # JSON array of Docker image references for use in scan matrix
-      # Example: ["torrust/tracker:develop","mysql:8.4","prom/prometheus:v3.5.0","grafana/grafana:12.3.1","caddy:2.10.2"]
+      # Example: ["torrust/tracker:develop","mysql:8.4","prom/prometheus:v3.5.1","grafana/grafana:12.4.2","caddy:2.10.2"]
       images: ${{ steps.extract.outputs.images }}
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v5
 
       - name: Install Rust toolchain
-        uses: actions-rust-lang/setup-rust-toolchain@v1
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache Rust dependencies
+        uses: Swatinem/rust-cache@v2
 
       - name: Build deployer CLI
         run: cargo build --release

src/shared/docker_image.rs

@@ -128,7 +128,7 @@ mod tests {
 
     #[test]
     fn it_should_create_from_str_tuple() {
-        let image = DockerImage::from(("prom/prometheus", "v3.5.0"));
+        let image = DockerImage::from(("prom/prometheus", "v3.5.1"));
 
         assert_eq!(image.full_reference(), "prom/prometheus:v3.5.1");
     }