This update for gn fixes the following issues:

Update to version 0.20260907:

  * Use ReachabilityCache to improve performance of loop detection
  * Support `target(target_type, name)` in `gn edit`
  * Cache reverse dependencies for dependency exposure.
  * Skip attempting to resolve known files as module names.
  * Cache file path -> target lookup in `gn suggest`.
  * Make `gn edit move` idempotent.
  * When re-running build/gen.py from ninja, preserve environment variables.
  * Implement pretty for several more types
  * Ensure `gn edit` follows the style guide for variable ordering.
  * Simplify code produced by gn edit.
  * Support setting expressions in `gn edit`
  * Revert "Write to ninja files via a standard API"
  * Write to ninja files via a standard API
  * Use move instead of add where suitable when suggesting fixes.
  * Fix EditCommandTest.ShardSubcommand
  * Support public_inputs in gn desc
  * Update `gn format` to always insert newlines before targets.
  * run_formatter.sh: Warn if `rustfmt` is not installed.
  * docs: Document that copy() uses the toolchain's copy tool
  * standard_out.h: Add ScopedBufferedOuptut class.
  * Support public_inputs in group targets
  * Run benchmarks serially.
  * Write benchmarks to out/before and out/after instead of out/
  * Add jj subcommands to easily compare revisions.
  * Add `build/gen.py --gen ~/chromium/src=out/Default`
  * Create a trace comparison tool to evaluate the performance impact of a change.
  * Allow host_os and host_cpu to be accessed in .gn files
  * Implement `gn edit "shard"` subcommand
  * Hint about --fix/--apply when running without them
  * Add support for creating new targets in `gn edit`
  * Support cloning of nodes in the AST.
  * Mark NOTREACHED as [[noreturn]]
  * Implement `gn check --fix`
  * Fix gn suggest adding self-dependency loops.
  * Add a `gn suggest --apply` option.
  * Add `gn edit` suggestions to `gn suggest`
  * Implement `gn edit "rename attr attr"`
  * Implement `gn edit "move attr attr value(s)"`
  * Implement `gn edit "add attribute value(s)"`
  * Implement `gn edit "remove attr value(s)"`
  * Refactor parse nodes to support non-const access.
  * Implement `gn edit delete` and `gn edit remove attr`
  * Implement `gn edit` command, and implement a simple subcommand "set"
  * Add features to test framework
  * Implement a Result<T> type.
  * Fix formatter on main branch
  * Fix path to build/gen.py.
  * Add pre-upload checks into ninja targets
  * Add --exclude-type command-line argument
  * Add CQ to starlark branch
  * Refactor main.star to support multiple branches.
  * Implement rule implementation execution.
  * Create a simple session type and create a test for it.
  * Fix lifetime of starlark struct keys passed to C++.
  * Rename .bzl to .scl in accordance with design doc guidance.
  * Split into two kinds of scopes - scopes and structs.