Patch release for GWpy 2.1.x. Bug fixes and other API-compatible changes: [#1521] fix compatibility with scipy 1.9.0 [#1523] deprecate the gwpy.utils.null_context function [#1530] fix some lint The full list of changes related to this milestone can be seen at https://github.com/gwpy/gwpy/pulls?q=is:pr+milestone:2.1.5