Made library compatible with PHP 8.4

### Changed
- Made library compatible with PHP 8.4, closes #6.
- Refactor GitHub Actions, related to #6.
- Update dev dependencies, related to #6.
- Remove dev dependencies `roave/no-leaks` and `boesing/psalm-plugin-stringf` due to conflict with newer PHP versions,
  related to #6.

Author: Syndesi

.github/workflows/ci-code-style.yml

@@ -0,0 +1,149 @@
+name: Test
+
+on:
+  - push
+  - pull_request
+
+jobs:
+
+  yml-lint:
+    runs-on: ubuntu-latest
+    name: 'YML lint'
+    timeout-minutes: 3
+    steps:
+      - uses: actions/checkout@v4
+      - run: docker pull cytopia/yamllint
+      - run: docker run --rm -t -v $(pwd):/data cytopia/yamllint --config-file=tests/.yamllint .
+
+  markdown-lint:
+    runs-on: ubuntu-latest
+    name: 'Markdown lint'
+    timeout-minutes: 3
+    steps:
+      - uses: actions/checkout@v4
+      - run: docker pull tmknom/markdownlint
+      - run: docker run --rm -v $(pwd):/work tmknom/markdownlint '**/*.md' --config tests/.markdownlintrc --ignore vendor --ignore CHANGELOG.md --ignore var --ignore tmp
+
+  cs-lint:
+    runs-on: ubuntu-latest
+    name: 'CS Lint'
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v4
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+          tools: composer:v2
+      - run: composer install --dev --ignore-platform-req=php --quiet
+        shell: bash
+      - run: PHP_CS_FIXER_IGNORE_ENV=1 composer cs:list
+        shell: bash
+
+  psalm:
+    runs-on: ubuntu-latest
+    name: 'Psalm'
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v4
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+          tools: composer:v2
+      - run: composer install --ignore-platform-req=php --quiet
+        shell: bash
+      - run: composer psalm
+        shell: bash
+
+  phpstan:
+    runs-on: ubuntu-latest
+    name: 'Phpstan'
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v4
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+          tools: composer:v2
+      - run: composer install --ignore-platform-req=php --quiet
+        shell: bash
+      - run: composer phpstan
+        shell: bash
+
+  test-unit:
+    runs-on: ubuntu-latest
+    name: "Unit tests (PHP ${{ matrix.php-version }}, Neo4j ${{ matrix.neo4j-version }})"
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version: ['8.2', '8.3', '8.4']
+        neo4j-version: ['4.4', '5.1.0', '5.26.2']
+    timeout-minutes: 5
+    env:
+      ENABLE_FEATURE_TEST: true
+      NEO4J_VERSION: ${{ matrix.neo4j-version }}
+    services:
+      neo4j:
+        image: neo4j:${{ matrix.neo4j-version }}-enterprise
+        env:
+          NEO4J_AUTH: neo4j/password
+          NEO4J_ACCEPT_LICENSE_AGREEMENT: yes
+        ports:
+          - "7474:7474"
+          - "7687:7687"
+    steps:
+      - uses: actions/checkout@v4
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          tools: composer:v2
+      - run: composer install --ignore-platform-req=php --quiet
+        shell: bash
+      - run: composer test
+        shell: bash
+      - run: cat ./tests/test.log
+        shell: bash
+
+  test-unit-coverage:
+    runs-on: ubuntu-latest
+    name: "Running unit test coverage"
+    env:
+      XDEBUG_MODE: coverage
+    timeout-minutes: 5
+    needs:
+      - test-unit
+    steps:
+      - uses: actions/checkout@v4
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+          extensions: xdebug
+          tools: composer:v2
+      - run: composer install --ignore-platform-req=php --quiet
+        shell: bash
+      - run: composer test:coverage:xml
+        shell: bash
+      - uses: paambaati/[email protected]
+        env:
+          CC_TEST_REPORTER_ID: 203d856fbc3ebebe66cc94cccde4429973298c7fb919df64a1557850cc9c8345
+        with:
+          coverageLocations: coverage.xml:clover
+      - uses: actions/upload-artifact@v4
+        with:
+          name: coverage.xml
+          path: coverage.xml
+
+  test-mutant:
+    runs-on: ubuntu-latest
+    name: 'Mutant Test'
+    timeout-minutes: 5
+    continue-on-error: true
+    steps:
+      - uses: actions/checkout@v4
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.4'
+          tools: composer:v2
+      - run: composer install --ignore-platform-req=php --quiet
+        shell: bash
+      - run: composer test:mutant
+        shell: bash