gopls: update to 0.12.2

0.12.2

This is an alias for the gopls/v0.12.1 release.

0.12.1

This release fixes a few regressions/crashes in the v0.12.0 release:

*  Unimported completion should use fuzzy matching
*  Fix a crash when method has receiver type comparable
*  Fix for documentHighlight on import paths
*  Clear vulncheck diagnostics when they are toggled off

0.12.0

This release contains a major rewrite of the way gopls computes and stores
package information, with the goal of reducing memory usage and allowing gopls
to scale to larger repositories. This change can also significantly reduce
startup time when workspaces are reopened, as gopls now uses a file-based cache
to persist data across sessions. With these optimizations, gopls is finally
able to fully analyze dependencies using the golang.org/x/tools/go/analysis
framework, resulting in improved accuracy for analysis diagnostics.

(bsiegert)