Bumb TASTy minor version

[nicolasstucki]

Preparing for 3.1

Closes #13385

[bishabosha]

This is failing because the build referenceVersion is a nightly (i.e. with experimental TASTy) - we cant use a nightly compiler to read TASTy produced by another nightly with different MinorVersion

[bishabosha]

if we can reset the reference version to a non nightly hopefully this would work

[nicolasstucki]

The first non-nightly version that would work as reference compiler will be 3.1.0-RC1

[bishabosha]

LGTM

[nicolasstucki]

To simplify our own builds, this should be the last PR from https://github.com/lampepfl/dotty/milestone/27 that we merge. Otherwise, we might need to rebuild the full compiler when switching branches.

[smarter]

This is failing because the build referenceVersion is a nightly (i.e. with experimental TASTy) - we cant use a nightly compiler to read TASTy produced by another nightly with different MinorVersion

But the reference compiler should never be used to read tasty produced by the compiler we compile, so this is likely a bug in the build.

[nicolasstucki]

But the reference compiler should never be used to read tasty produced by the compiler we compile, so this is likely a bug in the build.

I did not hit this. I just thought it might happen. If it never reads those tasty it is fine.