fix(deps): update dependency io.grpc:grpc-bom to v1.68.0 #2871

Job	Run time
build	3m 34s
generate-metadata	2m 3s
license-check	1m 58s
setup-muzzle-matrix	1m 56s
shellcheck	9s
smoke-test (ubuntu-22.04, glassfish)	6m 30s
smoke-test (ubuntu-22.04, jboss)	2m 54s
smoke-test (ubuntu-22.04, jetty)	5m 59s
smoke-test (ubuntu-22.04, liberty)	9m 8s
smoke-test (ubuntu-22.04, profiler)	6m 44s
smoke-test (ubuntu-22.04, tomcat)	5m 19s
smoke-test (ubuntu-22.04, tomee)	4m 21s
smoke-test (ubuntu-22.04, weblogic)	2m 48s
smoke-test (ubuntu-22.04, websphere)	7m 19s
smoke-test (ubuntu-22.04, wildfly)	7m 37s
smoke-test (ubuntu-22.04, other)	4m 50s
muzzle (:instrumentation:jetty)	2m 10s
muzzle (:instrumentation:khttp)	2m 7s
muzzle (:instrumentation:liberty)	2m 5s
muzzle (:instrumentation:tomcat)	2m 9s
muzzle (:instrumentation:weblogic)	2m 3s
muzzle (:instrumentation:websphere)	2m 2s
muzzle (:instrumentation:wildfly)	2m 10s
	1h 27m 55s

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