ci: fix YAML indentation in security-deep workflow

with/toolchain were indented under uses: instead of at step level.
Broken since 09dc062 (SHA-pinning actions).

Author: 27Bslash6

.github/workflows/security-deep.yml

@@ -101,8 +101,8 @@ jobs:
 
     - name: Set up Rust
       uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # stable
-        with:
-          toolchain: stable
+      with:
+        toolchain: stable
 
     - name: Cache Rust dependencies
       uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32 # v2