Upgrade backend dependencies and base images (#326)

Signed-off-by: Sergio Castaño Arteaga <[email protected]>

Author: tegioz

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.85.0
+          toolchain: 1.86.0
           components: clippy, rustfmt
       - name: Run clippy
         run: cargo clippy --all-targets --all-features -- --deny warnings
@@ -30,7 +30,7 @@ jobs:
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.85.0
+          toolchain: 1.86.0
       - name: Run backend tests
         run: cargo test