Bump trillian-opensource-ci/db_server from `febf72e` to `0447d06` in /config/trillian/mysql #1455

Job	Run time
Test github action with TUF (v1.27.x, main, 1.22.x, test github action with TUF)	4m 32s
Test github action with TUF (v1.28.x, main, 1.22.x, test github action with TUF)	4m 22s
Test github action with TUF (v1.29.x, main, 1.22.x, test github action with TUF)	4m 56s
Test github action with TUF (v1.30.x, main, 1.22.x, test github action with TUF)	4m 16s
	18m 6s

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