fix: replace bare except with except BaseException in token_create

[harshadkhetpal]

Summary

Replace bare except: clause with except BaseException: in cmk/gui/dashboard/api/token_create.py (PEP 8 E722).

Why: Bare except: is equivalent to except BaseException: but is less explicit. Since this block performs a rollback and re-raises, except BaseException: is the correct explicit form — it documents the intent to catch everything during the rollback.

Change:

# Before
except:
    # rollback token creation
    token_store.delete(token.token_id)
    raise

# After
except BaseException:
    # rollback token creation
    token_store.delete(token.token_id)
    raise

Testing

No behavior change — except BaseException: is semantically identical to except: but satisfies PEP 8 E722.

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