Fix misc DeprecationWarnings #4834

Job	Run time
Skip Duplicate Jobs Pre Job	7s
Pack Tests - Python 3.8	1m 33s
Integration Tests (chunk 1) - Python 3.8	4m 22s
Self-check on Python 3.8 - Python 3.8	7m 43s
Lint Checks (black, flake8, etc.) - Python 3.8	2m 0s
Integration Tests (chunk 2) - Python 3.8	4m 59s
Unit Tests (chunk 1) - Python 3.8	6m 15s
Pack Tests - Python 3.9	2m 26s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 10s
Integration Tests (chunk 1) - Python 3.9	4m 1s
Unit Tests (chunk 2) - Python 3.8	4m 30s
Lint Checks (black, flake8, etc.) - Python 3.9	2m 9s
Integration Tests (chunk 2) - Python 3.9	4m 53s
Unit Tests (chunk 1) - Python 3.9	5m 54s
Compile (pip deps, pylint, etc.) - Python 3.9	3m 3s
Unit Tests (chunk 2) - Python 3.9	5m 8s
Slack notification for failed master builds	3s
	1h 2m 16s

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