ci: Optimize linting workflow with parallel execution.

- Implement matrix strategy for Black, isort, and Flake8
- Enable parallel job execution (max 3 concurrent jobs)
- Add pip caching for faster dependency installation
- Update GitHub Actions versions (checkout@v4, setup-python@v5)
- Remove redundant steps and unify tool execution

Author: RandomProgramm3r

.github/workflows/lint.yml

@@ -0,0 +1,44 @@
+name: Linting
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        tool: [black, isort, flake8]
+      max-parallel: 3
+      fail-fast: false
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+          cache: 'pip'
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements/dev.txt
+
+      - name: Run ${{ matrix.tool }}
+        shell: bash
+        env:
+          TOOL: ${{ matrix.tool }}
+        run: |
+          $TOOL --version
+          $TOOL . --check --verbose