Bump trillian-opensource-ci/db_server from `58f8b09` to `c5195ff` in /config/trillian/mysql #1477

Job	Run time
Test github action with TUF (v1.27.x, main, 1.22.x, test github action with TUF)	4m 28s
Test github action with TUF (v1.28.x, main, 1.22.x, test github action with TUF)	5m 2s
Test github action with TUF (v1.29.x, main, 1.22.x, test github action with TUF)	5m 18s
Test github action with TUF (v1.30.x, main, 1.22.x, test github action with TUF)	5m 0s
	19m 48s

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