Bump job-dsl from 1.68 to 1.72

[dependabot[bot]]

Bumps job-dsl from 1.68 to 1.72.

Commits

• f492854 Releasing 1.72
• fd7a5c6 improved test
• a2dc2de fixed Groovy sandbox bypass via constructor invocation
• 0a8a304 Merge pull request #1156 from daspilker/JENKINS-55479
• f3fd560 disable GroovyShell cache for sandbox mode
• 9fdd595 Merge pull request #1155 from daspilker/instance
• 0093e78 Jenkins.getInstance() -> Jenkins.get()
• 86b4604 Merge pull request #1154 from daspilker/gradle5
• c6ef432 updated Gradle to 5.0 and Gradle JPI plugin to 0.28.1
• 207a6e1 Merge pull request #1153 from daspilker/JENKINS-55429
• Additional commits viewable in compare view

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