Update upickle to 1.6.0

[scala-steward]

Updates com.lihaoyi:upickle from 1.5.0 to 1.6.0.
GitHub Release Notes - Version Diff

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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Files still referring to the old version number

The following files still refer to the old version number (1.5.0).
You might want to review and update them manually.

docs/antora/modules/ROOT/pages/Plugin_Twirl.adoc

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "com.lihaoyi", artifactId = "upickle" } ]

labels: library-update, early-semver-minor, semver-spec-minor, old-version-remains, commit-count:1

[lefou]

Thanks Haoyi! Looks good to me. Although I wonder, whether this change means, that other mill plugins (build against Mill 0.10.0) may also fail to load with newer 0.10.3+ versions? Is this solely a compile-time issue, which is no longer relevant, once built?

[lihaoyi]

@lefou I think this may be a compile-time-only issue, since the only thing being removed is the def XXX = macro YYY. Presumably if you've already compiled, you'll already have the expanded code doing what the macro was previously doing, and things should work without issue.

[lefou]

Thanks to upickles binary backward compatibility since 1.4.0, this should be safe.