Cleanup recipe/cbc.yaml constrains, more platforms

[dbast]

This PR does multiple things:

• Cleans up the not required pinnings in conda_build_config.yaml ... they almost all became default
• Builds for oldest possible macos x86_64 (older versions result in symbols not found)... for osx arm64 the default macos pinning is fine
• Removes the recipe/library_licenses folder as that is best practise and as the folder is anyways deleted during builds (see https://github.com/conda-forge/tilt-feedstock/blob/main/recipe/build_library_licenses.sh#L8) and dynamically regenerated
• Build with node 20 only: there is no sense to build with two node version as the resulting code is frontend code for browsers (according to https://github.com/tilt-dev/tilt/blob/master/web/tsconfig.json#L3) and we do not build backend code linked to a specific node version here
• Enable linux-{aarch64, ppc64le} builds

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[dbast]

@conda-forge-admin please rerender

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[dbast]

@conda-forge/tilt ready for review. thanks!