Update dependency io.grpc:grpc-bom to v1.66.0 (#6631)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

dependencyManagement/build.gradle.kts

@@ -14,7 +14,7 @@ val DEPENDENCY_BOMS = listOf(
   "com.linecorp.armeria:armeria-bom:1.29.4",
   "com.squareup.okhttp3:okhttp-bom:4.12.0",
   "com.squareup.okio:okio-bom:3.9.0", // applies to transitive dependencies of okhttp
-  "io.grpc:grpc-bom:1.65.1",
+  "io.grpc:grpc-bom:1.66.0",
   "io.netty:netty-bom:4.1.112.Final",
   "io.zipkin.brave:brave-bom:6.0.3",
   "io.zipkin.reporter2:zipkin-reporter-bom:3.4.0",