fix: add pydeck lower version bound that was missing from pypsa <1.0.6

[coroa]

Changes proposed in this Pull Request

In some soft-forks through some version constraint interaction pydeck is pulled in at version 0.4. Here we make the minimum version of 0.6 explicit.

See also companion PRs: conda-forge/pypsa-feedstock#77 and PyPSA/PyPSA#1518

Checklist

• I tested my contribution locally and it works as intended.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to pixi.toml (using pixi add <dependency-name>).
• Changes in configuration options are added in config/config.default.yaml.
• Changes in configuration options are documented in doc/configtables/*.csv.
• For new data sources or versions, these instructions have been followed.
• A release note doc/release_notes.rst is added.