Remove unused InvalidSessionError #848

Job	Run time
Test readme renders on PyPi	18s
Test import order (isort)	44s
Linting (Ruff)	1m 0s
Tests on 3.8 (Minimum Versions)	12m 38s
Tests on 3.8	11m 47s
Tests on 3.9	11m 37s
Tests on 3.10	12m 43s
Tests on 3.11	11m 50s
Tests on 3.12	15m 57s
Test Docs / Build Documentation	26m 55s
	1h 45m 29s

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