Move lint tools configuration to pyproject.toml

This commit removes the mypy CI job, since there are no or few type
hints in the codebase and it failed on unrelated changes in the past.
It might be reintroduced when type hints get added.

.gitlab-ci.yml

@@ -219,7 +219,7 @@ lint_format_safety_bandit_checks:
         --ini .bandit
         || set_error
     - safety check --full-report || set_error
-    - pylint --rcfile=.pylint-rcfile --output-format=colorized --reports=n
+    - pylint --output-format=colorized --reports=n
             fdroid
             makebuildserver
             setup.py
@@ -234,26 +234,11 @@ lint_format_safety_bandit_checks:
     - exit $EXITVALUE
 
 
-lint_mypy:
-  image: debian:bullseye-backports
-  <<: *apt-template
-  script:
-    # use Debian packages to avoid building C/rust sources
-    - apt-get install
-          mypy
-          python3-cryptography
-          python3-pip
-          python3-wheel
-    - apt-get install -t bullseye-backports python3-pyjks
-    - pip install -e .[test]
-    - mypy
-
-
 black:
   image: python:slim
   script:
     - pip install black
-    - black --check --diff --color --skip-string-normalization
+    - black --check --diff --color
         examples/fdroid_extract_repo_pubkey.py
         examples/makebuildserver.config.py
         fdroid