Updated diktat version to 1.2.1

[orchestr7]

What’s done:

• Updated diktat version to a stable 1.2.1 release with minor bug fixes (after a non-stable 1.2.0)

[orchestr7]

This PR contains critical bugfixes that we introduced in our dirty 1.2.0 release :)

[nedtwigg]

I assume you want to bump this too?

spotless/lib/src/main/java/com/diffplug/spotless/kotlin/DiktatStep.java

Line 35 in aa9bb11

private static final String DEFAULT_VERSION = "1.2.0";

Don't worry about changelog for this PR, I will handle that as I am preparing to cut a release.

[orchestr7]

DEFAULT_VERSION

oh really, sorry for that, why do we have several versions? @Cheshiriks @nulls why not to unify them?
we have MIN_SUPPORTED_VERSION, DEFAULT_VERSION, VER_DIKTAT and hardcodes in tests!

UPD: Ah, I see - you are not able to share common version from gradle.build and MIN version will be different in the future with the DEFAULT one

[nulls]

DEFAULT_VERSION

oh really, sorry for that, why do we have several versions? @Cheshiriks @nulls why not to unify them?
we have MIN_SUPPORTED_VERSION, DEFAULT_VERSION, VER_DIKTAT and hardcodes in tests!

UPD: Ah, I see - you are not able to share common version from gradle.build and MIN version will be different in the future with the DEFAULT one

MIN_SUPPORTED_VERSION was introduced because of changes in ktlint library which diktat calls it directly.
It's not required to upgrade min version, but still useful