Bumps [actions/checkout](https://github.com/actions/checkout) from 6.0.0 to 6.0.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](https://github.com/actions/checkout/compare/v6...v6.0.1)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.1 to 6.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](https://github.com/actions/checkout/compare/v5.0.1...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.0 to 5.0.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](https://github.com/actions/checkout/compare/v5...v5.0.1)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 5.0.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

```
Rebasing (1/3)
Committer identity unknown

*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.
```

It was supposed to update a local branch in case the remote branch was
updated between actions/checkout and the end of tool/sync_default_gems.rb.

Note that this `git pull` didn't exist in the original bin/update-default-gem.sh
https://github.com/ruby/git.ruby-lang.org/commit/d9e9bcc60dcf0dd1cbdc2dd42bc0286439e471aa,
so it was newly introduced at https://github.com/ruby/ruby/commit/3ba5cfd1cb77b61b2b1ad1d03271bc1fe7b71969.

But `git pull --no-ff` failed when master had updates in an unrelated
repository. I think we need to use `git pull --rebase` instead.

This fixes:

* https://github.com/ruby/ruby/actions/runs/19207693793/job/54905403070
    * checkout: f08030e9dccf38d9ea5c9505203fe26484dc28d8
    * ruby tool/sync_default_gems.rb net-http ec9c70a6fba75a63c128864ef3cb32c883665a33..e4d80bd609f22cad04a2e2c1d54c981bb853c938
    * pull: 2bf82c627494e785737037bbaf9a6b98f3c6354c

```
tool/sync_default_gems.rb:177:in `block in <module:SyncDefaultGems>': undefined local variable or method `it' for SyncDefaultGems:Module (NameError)

      it.exclude << "lib/open3/jruby_windows.rb"
      ^^
	from <internal:kernel>:90:in `tap'
	from tool/sync_default_gems.rb:176:in `<module:SyncDefaultGems>'
	from tool/sync_default_gems.rb:10:in `<main>'
```

At the moment, we're not sure which gem relies on past renames. So we
try this, and revert it if it turns out to be necessary.

Given that it slows down every single sync, however, I'm thinking of
making tool/sync_default_gems.rb responsible for implementing all
necessary renames on cherry-picks using filter-branch (or any
modification on commits before pushing them).