Show Python 3.8 deprecation warning on Toolbox startup (#2914) #2400

Job	Run time
Execution tests (3.8, windows-latest)	4m 17s
Unit tests (3.8, windows-latest)	8m 29s
Execution tests (3.8, ubuntu-22.04)	2m 25s
Unit tests (3.8, ubuntu-22.04)	5m 50s
Execution tests (3.9, windows-latest)	5m 52s
Unit tests (3.9, windows-latest)	7m 53s
Execution tests (3.9, ubuntu-22.04)	2m 25s
Unit tests (3.9, ubuntu-22.04)	5m 47s
Execution tests (3.10, windows-latest)	5m 36s
Unit tests (3.10, windows-latest)	9m 19s
Execution tests (3.10, ubuntu-22.04)	2m 26s
Unit tests (3.10, ubuntu-22.04)	5m 51s
Execution tests (3.11, windows-latest)	5m 54s
Unit tests (3.11, windows-latest)	9m 10s
Execution tests (3.11, ubuntu-22.04)	2m 19s
Unit tests (3.11, ubuntu-22.04)	5m 36s
Execution tests (3.12, windows-latest)	6m 20s
Unit tests (3.12, windows-latest)	10m 8s
Execution tests (3.12, ubuntu-22.04)	2m 24s
Unit tests (3.12, ubuntu-22.04)	7m 31s
	1h 55m 32s

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