Bump the development-dependencies group across 1 directory with 3 updates (#2546)

* Bump the development-dependencies group across 1 directory with 3 updates

Bumps the development-dependencies group with 3 updates in the / directory: [brakeman](https://github.com/presidentbeef/brakeman), [faker](https://github.com/faker-ruby/faker) and [selenium-webdriver](https://github.com/SeleniumHQ/selenium).


Updates `brakeman` from 7.1.2 to 8.0.1
- [Release notes](https://github.com/presidentbeef/brakeman/releases)
- [Changelog](https://github.com/presidentbeef/brakeman/blob/main/CHANGES.md)
- [Commits](https://github.com/presidentbeef/brakeman/compare/v7.1.2...v8.0.1)

Updates `faker` from 3.5.3 to 3.6.0
- [Release notes](https://github.com/faker-ruby/faker/releases)
- [Changelog](https://github.com/faker-ruby/faker/blob/main/CHANGELOG.md)
- [Commits](https://github.com/faker-ruby/faker/compare/v3.5.3...v3.6.0)

Updates `selenium-webdriver` from 4.39.0 to 4.40.0
- [Release notes](https://github.com/SeleniumHQ/selenium/releases)
- [Changelog](https://github.com/SeleniumHQ/selenium/blob/trunk/rb/CHANGES)
- [Commits](https://github.com/SeleniumHQ/selenium/compare/selenium-4.39.0...selenium-4.40.0)

---
updated-dependencies:
- dependency-name: brakeman
  dependency-version: 8.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: development-dependencies
- dependency-name: faker
  dependency-version: 3.6.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
- dependency-name: selenium-webdriver
  dependency-version: 4.40.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: development-dependencies
...

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

* Auto-sync Gemfile.saas.lock on Dependabot PRs

Dependabot can't update custom-named Gemfiles, so Gemfile.saas.lock
drifts whenever it bumps shared gems in Gemfile.lock.

Add `bin/bundle-drift forward` to push oss lockfile changes into the
saas lockfile (the reverse of `correct`), and a GitHub Actions workflow
that runs it automatically on Dependabot bundler branches.

* Update brakeman ignore fingerprint for 8.0.1

Brakeman 8.0.1 changed how it computes warning fingerprints, so the
existing ignore entry for the safe_constantize warning in Notifier
became obsolete. Update to the new fingerprint.

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jeremy Daer <jeremy@37signals.com>

.github/workflows/dependabot-sync-saas-lockfile.yml

@@ -0,0 +1,35 @@
+name: Sync Gemfile.saas.lock
+
+on:
+  push:
+    branches:
+      - "dependabot/bundler/**"
+    paths:
+      - Gemfile.lock
+
+permissions:
+  contents: write
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: .ruby-version
+
+      - name: Forward Gemfile.lock changes to Gemfile.saas.lock
+        run: bin/bundle-drift forward
+
+      - name: Commit updated lockfile
+        run: |
+          git add Gemfile.saas.lock
+          if ! git diff --cached --quiet; then
+            git config user.name "github-actions[bot]"
+            git config user.email "github-actions[bot]@users.noreply.github.com"
+            git commit -m "Sync Gemfile.saas.lock"
+            git push
+          fi