Bump docker-client from 2021-08-07T20-46-00 to 2021-08-08T15-26-00

Bumps [docker-client](https://github.com/gesellix/docker-client) from 2021-08-07T20-46-00 to 2021-08-08T15-26-00.
- [Release notes](https://github.com/gesellix/docker-client/releases)
- [Changelog](https://github.com/gesellix/docker-client/blob/main/RELEASE.md)
- [Commits](https://github.com/gesellix/docker-client/commits)

---
updated-dependencies:
- dependency-name: de.gesellix:docker-client
  dependency-type: direct:production
...

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

plugin/build.gradle.kts

@@ -21,7 +21,7 @@ repositories {
 dependencies {
   api(gradleApi())
 
-  api("de.gesellix:docker-client:2021-08-07T20-46-00")
+  api("de.gesellix:docker-client:2021-08-08T15-26-00")
 
   testImplementation(localGroovy())
   testImplementation("org.spockframework:spock-core:2.0-groovy-2.5")