Bump grpc-bom from 1.23.0 to 1.24.0 (#196)

Bumps [grpc-bom](https://github.com/grpc/grpc-java) from 1.23.0 to 1.24.0.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.23.0...v1.24.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build.gradle

@@ -61,7 +61,7 @@ configure(subprojects.findAll { !it.name.startsWith("examples/") }) {
             mavenBom 'org.junit:junit-bom:5.5.2'
             mavenBom org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES
             mavenBom 'org.testcontainers:testcontainers-bom:1.12.2'
-            mavenBom 'io.grpc:grpc-bom:1.23.0'
+            mavenBom 'io.grpc:grpc-bom:1.24.0'
             mavenBom 'com.google.protobuf:protobuf-bom:3.10.0'
         }