Update dependency org.apache.maven.plugins:maven-shade-plugin to v3.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.apache.maven.plugins:maven-shade-plugin	3.5.3 -> 3.6.0

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[baldersheim]

Api breakage, need further work. Holding for now.

[baldersheim]

@bjorncs or @gjoranv Perhaps either of you can have a look at this on
07:46:12 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.13.0:compile (default-compile) on project bundle-plugin: Compilation failure: Compilation failure:
07:46:12 [ERROR] /sd/workspace/src/github.com/vespa-engine/vespa/bundle-plugin/src/main/java/com/yahoo/container/plugin/mojo/AssembleFatJarMojo.java:[20,48] package org.apache.maven.shared.dependency.graph does not exist
07:46:12 [ERROR] /sd/workspace/src/github.com/vespa-engine/vespa/bundle-plugin/src/main/java/com/yahoo/container/plugin/mojo/AssembleFatJarMojo.java:[21,48] package org.apache.maven.shared.dependency.graph does not exist
07:46:12 [ERROR] /sd/workspace/src/github.com/vespa-engine/vespa/bundle-plugin/src/main/java/com/yahoo/container/plugin/mojo/AssembleFatJarMojo.java:[22,48] package org.apache.maven.shared.dependency.graph does not exist
07:46:12 [ERROR] /sd/workspace/src/github.com/vespa-engine/vespa/bundle-plugin/src/main/java/com/yahoo/container/plugin/mojo/AssembleFatJarMojo.java:[58,12] cannot find symbol
07:46:12 [ERROR] symbol: class DependencyGraphBuilder
07:46:12 [ERROR] location: class com.yahoo.container.plugin.mojo.AssembleFatJarMojo
07:46:12 [ERROR] /sd/workspace/src/github.com/vespa-engine/vespa/bundle-plugin/src/main/java/com/yahoo/container/plugin/mojo/AssembleFatJarMojo.java:[163,56] cannot find symbol
07:46:12 [ERROR] symbol: class DependencyNode
07:46:12 [ERROR] location: class com.yahoo.container.plugin.mojo.AssembleFatJarMojo
07:46:12 [ERROR] -> [Help 1]