Bump kotlin-reflect from 1.5.0 to 1.5.20

Bumps [kotlin-reflect](https://github.com/JetBrains/kotlin) from 1.5.0 to 1.5.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.5.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.5.0...v1.5.20)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-reflect
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

doc-examples/example-kotlin/build.gradle

@@ -12,6 +12,6 @@ dependencies {
     implementation project(":gcp-function-http")
     implementation project(":gcp-secret-manager")
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.20"
-    implementation "org.jetbrains.kotlin:kotlin-reflect:1.5.0"
+    implementation "org.jetbrains.kotlin:kotlin-reflect:1.5.20"
     compileOnly 'com.google.cloud.functions:functions-framework-api:1.0.2'
 }