Use asyncio.gather instead of TaskGroup to avoid consumer crashes

[TheByronHimes]

There was a problem trying to run both event consumers simultaneously with the TaskGroup approach in asyncio. I reverted to the trusted .gather() style and it works now.

[coveralls]

Pull Request Test Coverage Report for Build 9177617315

Details

• 0 of 2 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+1.0%) to 88.955%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/nos/main.py	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/nos/main.py	1	0.0%

Totals
Change from base Build 9097003186:	1.0%
Covered Lines:	298
Relevant Lines:	335

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💛 - Coveralls