Upgrade GH actions to use Node20 features instead of 16

GH Actions has deprecated the use of Node 16, since it has reached
the end of its lifetime. Consequently, the outdated actions should
be upgraded. In case of Grammarinator, the checkout and setup-python
actions needs to be updated (v4 for checkout and v5 for setup-python).

.github/workflows/main.yml

@@ -10,10 +10,10 @@ jobs:
  runs-on: ${{ matrix.os }}
  steps:
  - run: git config --global core.autocrlf input
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  with:
  fetch-depth: 0
- - uses: actions/setup-python@v4
+ - uses: actions/setup-python@v5
  with:
  python-version: ${{ matrix.python-version }}
  - uses: actions/setup-java@v3
@@ -27,10 +27,10 @@ jobs:
  lint:
  runs-on: ubuntu-latest
  steps:
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  with:
  fetch-depth: 0
- - uses: actions/setup-python@v4
+ - uses: actions/setup-python@v5
  with:
  python-version: '3.11' # FIXME: experiencing SIGSEGV with py3.12.0
  - run: pip install --upgrade tox
@@ -39,10 +39,10 @@ jobs:
  cov:
  runs-on: ubuntu-latest
  steps:
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  with:
  fetch-depth: 0
- - uses: actions/setup-python@v4
+ - uses: actions/setup-python@v5
  with:
  python-version: '3.x'
  - run: pip install --upgrade tox coveralls
@@ -54,10 +54,10 @@ jobs:
  docs:
  runs-on: ubuntu-latest
  steps:
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  with:
  fetch-depth: 0
- - uses: actions/setup-python@v4
+ - uses: actions/setup-python@v5
  with:
  python-version: '3.x'
  - run: pip install --upgrade tox
@@ -67,10 +67,10 @@ jobs:
  needs: [test, lint, docs]
  runs-on: ubuntu-latest
  steps:
- - uses: actions/checkout@v3
+ - uses: actions/checkout@v4
  with:
  fetch-depth: 0
- - uses: actions/setup-python@v4
+ - uses: actions/setup-python@v5
  with:
  python-version: '3.x'
  - run: pip install --upgrade tox