Remove sstcheck from tests

.github/workflows/python-tests.yml

@@ -32,9 +32,6 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-    - name: Check README.rst syntax
-      run: |
-        rstcheck --report warning README.rst
     - name: Test building documentation
       run: |
         cd docs

requirements.txt

@@ -1,5 +1,4 @@
 tqdm>=4.31.1
-rstcheck>=3.3.1
 pygments>=2.11.1
 dnspython>=2.0.0
 expiringdict>=1.1.4
@@ -17,8 +16,6 @@ mailsuite>=1.6.1
 nose>=1.3.7
 wheel>=0.37.0
 flake8>=3.7.8
-doc8>=0.8.0
-collective.checkdocs>=0.2
 jinja2>=2.10.1
 packaging>=19.1
 imagesize>=1.1.0