Bump org.jetbrains.kotlinx:kotlinx-coroutines-core in /examples (#551)

Bumps [org.jetbrains.kotlinx:kotlinx-coroutines-core](https://github.com/Kotlin/kotlinx.coroutines) from 1.7.3 to 1.8.0.
- [Release notes](https://github.com/Kotlin/kotlinx.coroutines/releases)
- [Changelog](https://github.com/Kotlin/kotlinx.coroutines/blob/master/CHANGES.md)
- [Commits](Kotlin/kotlinx.coroutines@1.7.3...1.8.0)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlinx:kotlinx-coroutines-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/gradle/libs.versions.toml

@@ -9,7 +9,7 @@ palantir-graal = { id = "com.palantir.graal", version = "0.12.0" }
 jib = { id = "com.google.cloud.tools.jib", version = "3.4.1" }
 
 [libraries]
-kotlinx-coroutines-core = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-core", version = "1.7.3" }
+kotlinx-coroutines-core = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-core", version = "1.8.0" }
 grpc-protobuf = { group = "io.grpc", name = "grpc-protobuf", version = "1.62.2" }
 grpc-protobuf-lite = { group = "io.grpc", name = "grpc-protobuf-lite", version = "1.62.2" }
 grpc-netty = { group = "io.grpc", name = "grpc-netty", version = "1.62.2" }