fix(deps): update dependency gbulb to v0.6.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gbulb	0.6.5 -> 0.6.6

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Release Notes

beeware/gbulb (gbulb)

v0.6.6

Compare Source

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Bugfixes

• Unix socket handling was corrected to support changes in Python 3.13. (#&#8203;176 <https://github.com/beeware/gbulb/issues/176>__)
• PyGObject support was pinned to an upper version less than 3.50.0. (#&#8203;185 <https://github.com/beeware/gbulb/issues/185>__)

Misc

• #​138, #​139, #​140, #​141, #​142, #​143, #​144, #​145, #​146, #​147, #​148, #​149, #​150, #​151, #​152, #​153, #​154, #​155, #​156, #​157, #​158, #​159, #​160, #​161, #​162, #​163, #​164, #​165, #​166, #​167, #​168, #​170, #​172, #​173, #​175, #​178, #​180, #​181, #​182, #​183, #​184

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