Timestamp parsing failure with timezone information

[KellianL]

Description

The current implementation of _extract_timestamp() in src/powerapi/report/report.py, fails to parse valid ISO 8601 timestamps that include timezone information (e.g., '2025-04-03T12:36:20.800232411+00:00').
The function only handles ISO 8601 timestamps without timezone information.

Expected Behavior

The function should successfully parse ISO 8601 timestamps with timezone information.

Current Behavior

The function raises a ValueError when parsing timestamps with timezone information.

Example code

from datetime import datetime
from powerapi.report.report import Report

timestamp = '2025-04-03T12:36:20.800232411+00:00'

try:
    ts = Report._extract_timestamp(timestamp)
    print(f"Timestamp: {ts}")
except ValueError as e:
    print(f"Error: {e}")

Versions

powerapi : 2.10.0
python : 3.13.2

Optional notes

• datetime.fromisoformat() was added in Python 3.7