chore(deps): update griefed/baseimage-ubuntu-jdk-8 docker tag to v2

This MR contains the following updates:

Package	Type	Update	Change
griefed/baseimage-ubuntu-jdk-8	final	major	1.0.5 -> 2.0.0
griefed/baseimage-ubuntu-jdk-8	stage	major	1.0.5 -> 2.0.0

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Dockerfile.gradle

-FROM griefed/baseimage-ubuntu-jdk-8:1.0.5 AS builder
+FROM griefed/baseimage-ubuntu-jdk-8:2.0.0 AS builder
 
 RUN \
   apt-get update && apt-get upgrade -y && \
@@ -13,7 +13,7 @@ RUN \
   ./gradlew about installQuasar cleanFrontend assembleFrontend copyDist build --info -x test && \
   ls -ahl ./build/libs/
 
-FROM griefed/baseimage-ubuntu-jdk-8:1.0.5
+FROM griefed/baseimage-ubuntu-jdk-8:2.0.0
 
 LABEL maintainer="Griefed <griefed@griefed.de>"
 LABEL description="DESCRIPTION"