Incorrect normalizes `ruamel.yaml` dep to `ruamel_yaml`, missing static mapping lookup

[TomNicholas]

Problem

Every time we update our package's conda-forge feedstock this requires manual correction.

Cause

When the bot updates a feedstock with ruamel.yaml as a run dependency, it rewrites it as ruamel_yaml in meta.yaml, which does not exist on conda-forge and breaks the build:

Could not solve for environment specs
└─ ruamel_yaml >=0.17,<1.0 * does not exist

The static mapping at conda_forge_tick/pypi_name_mapping_static.yaml already has the correct entry:

- pypi_name: ruamel-yaml
  import_name: ruamel.yaml
  conda_name: ruamel.yaml

The problem is that the mapping is keyed on the dash-normalized PyPI name (ruamel-yaml), but when the bot encounters ruamel.yaml in wheel metadata it normalizes dots to underscores (ruamel_yaml) before the lookup, so the mapping is never hit and the bad name passes through.

Possible fixes:

1. Quick fix: Add a second entry to the static mapping with the underscore form so the lookup hits regardless:

- pypi_name: ruamel_yaml
  import_name: ruamel.yaml
  conda_name: ruamel.yaml

2. Proper fix: Normalize to dashes (not underscores) before the mapping lookup — ruamel.yaml → ruamel-yaml → lookup hit → ruamel.yaml ✓. This would fix the same bug for any other dot-named packages without needing duplicate entries.