Upgrade dependencies and gradle version

[vitarb]

Before:

❯ ./gradlew checkUpdates

> Task :temporal-sdk:checkDependencyUpdates
New dependency version: com.cronutils:cron-utils: 9.1.1 -> 9.1.3
New dependency version: com.fasterxml.jackson.core:jackson-databind: 2.11.3 -> 2.12.0
New dependency version: com.fasterxml.jackson.datatype:jackson-datatype-jsr310: 2.11.3 -> 2.12.0
New dependency version: io.micrometer:micrometer-core: 1.6.0 -> 1.6.2
New dependency version: name.remal.check-updates:name.remal.check-updates.gradle.plugin: 1.1.4 -> 1.1.6

> Task :temporal-sdk:checkGradleUpdates
New Gradle version is available: 6.7.1 (downloadUrl: https://services.gradle.org/distributions/gradle-6.7.1-bin.zip)

> Task :temporal-serviceclient:checkDependencyUpdates
New dependency version: com.google.protobuf:com.google.protobuf.gradle.plugin: 0.8.13 -> 0.8.14
New dependency version: com.google.protobuf:protobuf-gradle-plugin: 0.8.13 -> 0.8.14
New dependency version: com.google.protobuf:protobuf-java-util: 3.13.0 -> 3.14.0
New dependency version: com.google.protobuf:protoc: 3.13.0 -> 3.14.0
New dependency version: com.uber.m3:tally-core: 0.6.1 -> 0.9.1
New dependency version: io.grpc:grpc-core: 1.33.1 -> 1.34.0
New dependency version: io.grpc:grpc-netty-shaded: 1.33.1 -> 1.34.0
New dependency version: io.grpc:grpc-protobuf: 1.33.1 -> 1.34.0
New dependency version: io.grpc:grpc-stub: 1.33.1 -> 1.34.0
New dependency version: io.grpc:protoc-gen-grpc-java: 1.33.1 -> 1.34.0
New dependency version: name.remal.check-updates:name.remal.check-updates.gradle.plugin: 1.1.4 -> 1.1.6

> Task :temporal-serviceclient:checkGradleUpdates
New Gradle version is available: 6.7.1 (downloadUrl: https://services.gradle.org/distributions/gradle-6.7.1-bin.zip)

After:

❯ ./gradlew checkUpdates

> Task :temporal-serviceclient:checkDependencyUpdates
New dependency version: com.uber.m3:tally-core: 0.6.1 -> 0.9.1