Bump gwt.version from 2.9.0 to 2.10.0

[dependabot[bot]]

Bumps gwt.version from 2.9.0 to 2.10.0. Updates gwt-user from 2.9.0 to 2.10.0

Updates gwt-maven-plugin from 2.9.0 to 2.10.0

Commits

• 254c808 [maven-release-plugin] prepare release gwt-maven-plugin-2.10.0
• 47b3295 Support the setProperty option from the GWT compiler
• b2833a5 Add test for coverage configuration
• 7dda507 Expose coverage options
• 6b0d50b Update generated-archetype and apply HEAD-SNAPSHOT strategy
• 5a34bd6 Explain MGWT-347 in gwt:resources goal documentation
• 9dbae39 Bump dependencies by dependabot
• cf16dfb Fix typed method name generation and also add method name in comment
• af4001e Update to GWT 2.10, with the changed groupId and htmlunit browsers
• 62d2f1c [maven-release-plugin] prepare for next development iteration
• See full diff in compare view

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[cpovirk]

(I had played with this a bit in https://github.com/google/truth/pull/996 and found that we'd likely need to update to the tbroyer Maven plugin in order to update the GWT version.)

[dependabot[bot]]

Looks like these dependencies are no longer updatable, so this is no longer needed.