Update V.metals to v1.6.7 #2248

Job	Run time
Tests (ubuntu-latest, 11)	2m 5s
bazel	1m 26s
Tests (ubuntu-latest, 17)	1m 57s
bazel_aspect	3m 11s
Maven tests (11)	2m 48s
Maven tests (21)	2m 38s
Tests (ubuntu-latest, 21)	1m 59s
Docker CLI tests (ubuntu-latest)	5m 41s
Maven tests (17)	2m 41s
Maven tests (8)	3m 1s
check	2m 12s
Tests (ubuntu-latest, 8)	2m 14s
	31m 53s

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