Bump jruby from 9.4.1.0-jdk11 to 9.4.2.0-jdk11 in /docker

Bumps jruby from 9.4.1.0-jdk11 to 9.4.2.0-jdk11.

---
updated-dependencies:
- dependency-name: jruby
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docker/Dockerfile

@@ -8,7 +8,7 @@
 # RUN:
 #   docker run -e VMPOOLER_CONFIG -p 80:4567 -it vmpooler
 
-FROM jruby:9.4.1.0-jdk11
+FROM jruby:9.4.2.0-jdk11
 
 LABEL org.opencontainers.image.description "VMPooler plus all known providers"
 

docker/Dockerfile.local

@@ -9,7 +9,7 @@
 # Then change directory into vmpooler-projects and build with: 
 
 
-FROM jruby:9.4.1.0-jdk11
+FROM jruby:9.4.2.0-jdk11
 
 LABEL org.opencontainers.image.description "VMPooler plus all known providers"