Return attribute dict directly without temporary variable

[springstan]

Breaking change

Proposed change

Just some quick clean up to remove using unnecessary attribute dictionary and then immediately returning them.

# Before
def attributes(self):
    attr = {"key": "value"}
    return attr

# After
def attributes(self):
    return {"key": "value"}

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• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
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[MartinHjelmare]

Good!