Update deps, reformat

[jakebailey]

• Update to gofumpt v0.9
  • This now formats to fix naked returns.
  • I removed the -lang=... bit from everywhere, which I don't think does anything anymore. Was needed at some point in the past.
  • dprint now lets you configure a filename for the cache key, so use go.mod.
  • Downside: gopls still vendors v0.8. Oh well.
• Update the rest of the deps, and update NOTICE.

[Copilot]

Pull Request Overview

Updates dependencies to their latest versions (particularly gofumpt to v0.9) and removes the deprecated -lang=... parameter from gofumpt commands throughout the codebase. The new gofumpt version automatically formats code to fix naked returns, making the codebase more consistent with Go best practices.

• Updated all dependencies in go.mod and _tools/go.mod to their latest versions
• Removed -lang=... parameter from all gofumpt commands in go:generate directives and configuration files
• Fixed naked returns throughout the codebase by explicitly returning named values

Reviewed Changes

Copilot reviewed 23 out of 25 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
go.mod	Updated main module dependencies to latest versions
_tools/go.mod	Updated tools dependencies to latest versions
NOTICE.txt	Updated dependency license information to reflect new versions
.dprint.jsonc	Removed -lang=go1.25 parameter from gofumpt command
Multiple internal/*.go files	Removed -lang=go1.25 parameter from go:generate directives
Multiple internal/*.go files	Fixed naked returns by explicitly returning values