Bump the dependencies group with 2 updates

[dependabot]

Bumps the dependencies group with 2 updates: org.gwtproject:gwt-user and org.gwtproject:gwt-dev.

Updates org.gwtproject:gwt-user from 2.11.0 to 2.12.1

Updates org.gwtproject:gwt-dev from 2.11.0 to 2.12.1

Updates org.gwtproject:gwt-dev from 2.11.0 to 2.12.1

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[cpovirk]

@dependabot ignore org.gwtproject:gwt-user
@dependabot ignore org.gwtproject:gwt-dev

We can't do this at the moment for at least two reasons:

• GWT 2.12.1 (and I think anything higher than 2.11.0) requires Maven to be run under Java 11. Our Java 8 CI job currently uses Java 8 even for Maven itself, rather than using a newer version for Maven and then using Java 8 to run tests. We could change that, as in Mess around more with Javadoc and Maven toolchains: guava#7591, but I'm not sure it's worth it, especially when Truth might end up being a guinea pig for a migration off Maven. (This is the problem that causes the CI failure that happened during this run.)
• Even under Java 11+, we have another problem because of the mismatch between the guava-android bytecode and the guava-jre GWT sources (as noted in Decouple the version of GWT from the version of the GWT Maven Plugin, and bump GWT. #1378). That could probably be solved by separating out the Truth tests into their own submodule (as we do for Guava) or in other ways. But again, it's hard to get excited about doing anything about this.

[cpovirk]

@dependabot ignore org.gwtproject:gwt-user

[dependabot]

OK, I won't notify you about org.gwtproject:gwt-user again, unless you unignore it.

[cpovirk]

@dependabot ignore org.gwtproject:gwt-dev

[dependabot]

OK, I won't notify you about org.gwtproject:gwt-dev again, unless you unignore it.

[dependabot]

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