Bump org.jetbrains.intellij.platform from 2.12.0 to 2.16.0

[dependabot]

Bumps org.jetbrains.intellij.platform from 2.12.0 to 2.16.0.

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[auto-submit]

autosubmit label was removed for flutter/flutter-intellij/8945, because - The status or check suite kokoro-mac has failed. Please fix the issues identified (or deflake) before re-applying this label.

[pq]

This one is failing the kokoro build w/ an error that concludes like this:

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':compileKotlin'.
> Cannot find a Java installation on your machine (Mac OS X 14.6.1 x86_64) matching: {languageVersion=21, vendor=any vendor, implementation=vendor-specific, nativeImageCapable=false}. Toolchain download repositories have not been configured.

* Try:
> Learn more about toolchain auto-detection and auto-provisioning at [https://docs.gradle.org/9.4.1/userguide/toolchains.html#sec:auto_detection](https://www.google.com/url?q=https://docs.gradle.org/9.4.1/userguide/toolchains.html%23sec:auto_detection&sa=D).
> Learn more about toolchain repositories at [https://docs.gradle.org/9.4.1/userguide/toolchains.html#sub:download_repositories](https://www.google.com/url?q=https://docs.gradle.org/9.4.1/userguide/toolchains.html%23sub:download_repositories&sa=D).
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at [https://help.gradle.org](https://www.google.com/url?q=https://help.gradle.org&sa=D).

BUILD FAILED in 4m 13s
Configuration cache entry stored.

[pq]

My guess is the culprit is our current

ideaVersion=2025.2.3.9

and that we want to bump to 2026.1.*.

/fyi @helin24

[dependabot]

Looks like org.jetbrains.intellij.platform is up-to-date now, so this is no longer needed.