Consolidate dependency updates and add Python 3.14 support

[Ian Hellen (ianhelle)]

Summary

Consolidates the dependency updates from #924, #925, #926, #927, and #928:

• folium 0.20.0
• aiohttp 3.14.3
• dnspython 2.8.0
• panel 1.9.3
• NumPy 2.x, with Python-compatible release lines
• package version 3.0.2 -> 3.0.3
• add Python 3.14 to package classifiers and CI

NumPy compatibility

NumPy 2.5.1 requires Python 3.12+, which made #928 uninstallable on the supported Python 3.10 and 3.11 builds. There is no open NumPy Dependabot security alert for this repository and #928 is a routine version update, so this PR retains those supported Python versions and selects the newest compatible NumPy line:

• Python 3.10: NumPy 2.2.x
• Python 3.11: NumPy 2.4.x
• Python 3.12+: NumPy 2.5.1+

Local validation

• Ruff
• mypy
• dependency resolution for each NumPy/Python compatibility tier
• full tests: 1454 passed, 68 skipped; 9 local-only failures require an unavailable MaxMind GeoIP database/configuration

Closes #924
Closes #925
Closes #926
Closes #927
Closes #928