Remove support for Python 3.7 #357

Job	Run time
get-test-groups	7s
"python=3.8", group_spark_001	1s
"python=3.8", group_notebooks_spark_001	1s
"python=3.8", group_notebooks_spark_002	1s
"python=3.8", group_gpu_001	12m 53s
"python=3.8", group_gpu_002	1s
"python=3.8", group_notebooks_gpu_001	1s
"python=3.8", group_notebooks_gpu_002	1s
"python=3.8", group_cpu_001	12m 52s
"python=3.8", group_notebooks_cpu_001	1s
"python=3.9", group_spark_001	1s
"python=3.9", group_notebooks_spark_001	1s
"python=3.9", group_notebooks_spark_002	1s
"python=3.9", group_gpu_001	1s
"python=3.9", group_gpu_002	1s
"python=3.9", group_notebooks_gpu_001	1s
"python=3.9", group_notebooks_gpu_002	1s
"python=3.9", group_cpu_001	1s
"python=3.9", group_notebooks_cpu_001	1s
"python=3.10", group_spark_001	12m 54s
"python=3.10", group_notebooks_spark_001	12m 53s
"python=3.10", group_notebooks_spark_002	12m 53s
"python=3.10", group_gpu_001	12m 54s
"python=3.10", group_gpu_002	12m 55s
"python=3.10", group_notebooks_gpu_001	12m 54s
"python=3.10", group_notebooks_gpu_002	12m 53s
"python=3.10", group_cpu_001	12m 54s
"python=3.10", group_notebooks_cpu_001	12m 52s
"python=3.11", group_spark_001	12m 52s
"python=3.11", group_notebooks_spark_001	12m 51s
"python=3.11", group_notebooks_spark_002	12m 53s
"python=3.11", group_gpu_001	12m 36s
"python=3.11", group_gpu_002	12m 35s
"python=3.11", group_notebooks_gpu_001	12m 42s
"python=3.11", group_notebooks_gpu_002	12m 49s
"python=3.11", group_cpu_001	12m 40s
"python=3.11", group_notebooks_cpu_001	12m 52s
	4h 17m 0s

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