Update dependencies and Dockerfiles for revival

- Update python-telegram-bot from 20.6 to 21.11.1 (latest 21.x)
- Update pandas to 3.0.1, requests to 2.32.5, cachetools to 7.0.1
- Update humanize to 4.15.0, markdownify to 1.2.2, schedule to 1.2.2
- Update mplfinance to 0.12.10a7, ruff to 0.15.2
- Add pytest 9.0.2 to dev requirements
- Update Dockerfiles to Python 3.12-bookworm/slim
- Enable ruff linting in GitLab CI with updated Python 3.12 image

dev-reqs.txt

@@ -1,10 +1,11 @@
--r common/requirements.txt
--r site/requirements.txt
-ipython==8.16.1
-jupyter_client==8.4.0
-jupyter_core==5.4.0
-pylama==8.4.1
-mypy==1.5.1
-types-cachetools==5.3.0.6
-types-pytz==2023.3.1.1
-ruff==0.1.6
+-r common/requirements.txt
+-r site/requirements.txt
+ipython==8.16.1
+jupyter_client==8.4.0
+jupyter_core==5.4.0
+pylama==8.4.1
+mypy==1.5.1
+types-cachetools==5.3.0.6
+types-pytz==2023.3.1.1
+ruff==0.15.2
+pytest==9.0.2