add astyle and black to lalsuite-dev environment.yml
Description
closes #774 (closed)
Getting black from conda-forge, with the same 2022 version pin @karl-wette used for the CI here, and astyle via pip (latest version, though we might want to pin that too if we decide to move the CI linter to conda+pip rather than EL8 system packages - see #775)
API Changes and Justification
Backwards Compatible Changes
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This change does not modify any class/function/struct/type definitions in a public C header file or any Python class/function definitions -
This change adds new classes/functions/structs/types to a public C header file or Python module
Backwards Incompatible Changes
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This change modifies an existing class/function/struct/type definition in a public C header file or Python module -
This change removes an existing class/function/struct/type from a public C header file or Python module
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.