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

telegram/Dockerfile

@@ -1,22 +1,22 @@
-FROM python:3.11-buster AS builder
-
-
-COPY telegram/telegram-reqs.txt .
-COPY common/requirements.txt .
-
-RUN pip install --user -r telegram-reqs.txt
-
-
-FROM python:3.11-slim
-
-ENV MPLBACKEND=Agg
-
-COPY --from=builder /root/.local /root/.local
-
-
-COPY common common
-COPY telegram .
-
-
-
-CMD [ "python", "./bot.py" ]
+FROM python:3.12-bookworm AS builder
+
+
+COPY telegram/telegram-reqs.txt .
+COPY common/requirements.txt .
+
+RUN pip install --user -r telegram-reqs.txt
+
+
+FROM python:3.12-slim
+
+ENV MPLBACKEND=Agg
+
+COPY --from=builder /root/.local /root/.local
+
+
+COPY common common
+COPY telegram .
+
+
+
+CMD [ "python", "./bot.py" ]