CI cleanup fixes

[Marenz]

• Set min numpy version to lowest prebuilt python3.13-compatible release
• ComponentTracker: Use run_forever with eventloop fixes for _run() loop
• Actor: Don't restart on RuntimeError:No Running Eventloop
• Use get_running_loop() instead of str cmp to check for a running event loop
• cancel_and_wait: Re-raise if it was our task
• Fix swallowing of cancel error in Formula Engine & Voltage streamer

[Copilot]

Pull Request Overview

This PR cleans up CI compatibility and refines event loop and cancellation handling across several components.

• Bump numpy to ≥2.1.0 for Python 3.13 compatibility
• Propagate CancelledError instead of breaking loops in FormulaEngine and VoltageStreamer
• Centralize continuous retry loops via run_forever and prevent actor restarts when no running event loop
• Improve cancel_and_await to re-raise cancellation and abort on missing event loop

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/frequenz/sdk/timeseries/formula_engine/_formula_engine.py	Replace break with raise for CancelledError propagation
src/frequenz/sdk/timeseries/_voltage_streamer.py	Replace break with raise for CancelledError propagation
src/frequenz/sdk/microgrid/_power_distributing/_component_status/_battery_status_tracker.py	Wrap the main loop in run_forever
src/frequenz/sdk/actor/_actor.py	Skip restart when no event loop is running
src/frequenz/sdk/_internal/_asyncio.py	Refine cancel_and_await, add is_loop_running, abort on missing loop
pyproject.toml	Update numpy dependency to >=2.1.0,<3

Comments suppressed due to low confidence (1)

src/frequenz/sdk/actor/_actor.py:109

• [nitpick] The new branch that skips restarts when no event loop is running should be covered by a unit or integration test to prevent regressions.

                if not is_loop_running():