Drop Python 3.8 support #1910

Job	Run time
Test frontend	24s
Lint	1m 10s
Test mcp-server on 3.9	8m 58s
Test mcp-server on 3.10	8m 53s
Test mcp-server on 3.11	10m 10s
Test mcp-server on 3.12	11m 54s
Test mcp-client on 3.9	10m 10s
Test mcp-client on 3.10	9m 30s
Test mcp-client on 3.11	9m 4s
Test mcp-client on 3.12	10m 21s
Test dashboard on 3.9	10m 21s
Test dashboard on 3.10	10m 28s
Test dashboard on 3.11	11m 12s
Test dashboard on 3.12	11m 44s
Test archivematica-common on 3.9	10m 34s
Test archivematica-common on 3.10	8m 25s
Test archivematica-common on 3.11	10m 33s
Test archivematica-common on 3.12	10m 11s
Test storage-service on 3.9	10m 20s
Test migrations on 3.9	10m 18s
	3h 4m 40s

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