Bump golang.org/x/tools from 0.20.0 to 0.21.0

[dependabot[bot]]

Bumps golang.org/x/tools from 0.20.0 to 0.21.0.

Commits

• cc29c91 go.mod: update golang.org/x dependencies
• 397fef9 gopls/internal/protocol: add links to LSP spec
• e2a352c internal/refactor/inline: extensible API
• c16c816 go/analysis/passes/stdversion: test *.go < go.mod version
• 629a7be go/analysis/analysistest: stricter errors and GOWORK setting
• 4db1697 go/packages/packagestest: fold modules_111.go into modules.go
• ccdef3c gopls/internal/golang: fix nil panic in InlayHint
• 74c9cfe go/analysis: add Pass.ReadFile
• 5ef4fc9 gopls/internal/golang/completion: fix the isEmptyInterface predicate
• 77f691b internal/gcimporter: use Alias.Rhs, not unsafe hack
• Additional commits viewable in compare view

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