lib: cmetrics: upgrade to v0.6.4 #8185

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	20m 45s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	19m 58s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	18m 59s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	18m 18s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	18m 35s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	18m 53s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	19m 20s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	19m 21s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	18m 43s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	19m 15s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	52m 7s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	17m 54s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	18m 33s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	19m 2s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	18m 59s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	13m 57s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	11m 9s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	10m 4s
Unit tests (matrix)	1s
	5h 53m 53s

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