Adapt to Pandas 2.2.0

[k-knosala]

Pandas 2.2.0 introduces some deprecations that need to be addressed:

• Chained assignments
• Changed Timedelta.resolution_string() to return h, min, s, ms, us, and ns instead of H, T, S, L, U, and N, for compatibility with respective deprecations in frequency aliases
• and maybe more, see the documentation for the full list