Upgrade GH actions to use Node 20 features instead of 16 (#229)

GH Actions have 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 Consequently, the outdated actions should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, setup-java
and setup-python actions need to be updated
(v4 for checkout and setup-java, and v5 for setup-python).

.github/workflows/main.yml

@@ -10,13 +10,13 @@ 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
+      - uses: actions/setup-java@v4
         with:
           java-version: 17
           distribution: temurin
@@ -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