fix(ci): correct YAML syntax in Python workflow job

- Move cache and cache-dependency-path options to actions/setup-python with block
- Use requirements-lock.txt consistently for dependency installation
- Remove duplicate pip install step
- Clean up extraneous blank lines

Author: aviralgarg05

.github/workflows/ci.yml

@@ -37,7 +37,6 @@ jobs:
             ~/.cargo/bin
             target
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
-
           restore-keys: ${{ runner.os }}-cargo-
 
       - name: Install cargo-audit
@@ -54,7 +53,7 @@ jobs:
 
       - name: tests
         run: cargo test --workspace -- --test-threads=1
-      
+
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
 
@@ -67,13 +66,11 @@ jobs:
           files: lcov.info
           token: ${{ secrets.CODECOV_TOKEN }}
 
-
       - name: Build documentation
         run: cargo doc --workspace --no-deps
         env:
           RUSTDOCFLAGS: -D warnings
 
-
       - name: Security audit
         run: cargo audit
 
@@ -87,14 +84,12 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.10'
-      - name: Install Python dependencies
-        run: pip install -r nexum_ai/requirements-lock.txt
+          python-version: "3.10"
           cache: "pip"
-          cache-dependency-path: nexum_ai/requirements.txt
+          cache-dependency-path: nexum_ai/requirements-lock.txt
 
       - name: Install dependencies
-        run: pip install -r nexum_ai/requirements.txt
+        run: pip install -r nexum_ai/requirements-lock.txt
 
       - name: Byte-compile nexum_ai
         run: python -m compileall nexum_ai