Merge pull request #396 from bugsnag/tom/remove-gem-lock #938

Job	Run time
test (3.8, ubuntu-latest)	4m 45s
test (3.9, ubuntu-latest)	5m 0s
test (3.10, ubuntu-latest)	4m 17s
test (3.11, ubuntu-latest)	2m 57s
test (3.12, ubuntu-latest)	3m 48s
test (3.13, ubuntu-latest)	4m 10s
test (3.5, ubuntu-20.04, pypi.python.org pypi.org files.pythonhosted.org)	6m 5s
test (3.6, ubuntu-20.04)	6m 53s
test (3.7, ubuntu-22.04)	6m 33s
Finish Coveralls processing	12s
	44m 40s

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