v2.15.3

• Fixed a crash in the unhashable-member checker when using a lambda as a dict key.

  Closes #7453

• Fix a crash in the modified-iterating-dict checker involving instance attributes.

  Closes #7461

• invalid-class-object does not crash anymore when __class__ is assigned alongside another variable.

  Closes #7467

• Fix false positive for global-variable-not-assigned when a global variable is re-assigned via an ImportFrom node.

  Closes #4809

• Fix false positive for undefined-loop-variable in for-else loops that use a function
  having a return type annotation of NoReturn or Never.

  Closes #7311

• --help-msg now accepts a comma-separated list of message IDs again.

  Closes #7471