fix(deps): update grailsgradlepluginversion to v6.1.2 #860

Job	Run time
core-tests	5m 15s
functional-test (static)	2m 34s
build	0s
functional-test (annotation)	3m 8s
functional-test (requestmap)	2m 35s
functional-test (basic)	2m 16s
functional-test (misc)	3m 50s
functional-test (putWithParams)	2m 6s
functional-test (bcrypt)	3m 37s
functional-test (issue503)	2m 7s
	27m 28s

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