Bump sqlite3 from 1.6.8 to 1.6.9 in /graph-sample

Bumps [sqlite3](https://github.com/sparklemotion/sqlite3-ruby) from 1.6.8 to 1.6.9.
- [Release notes](https://github.com/sparklemotion/sqlite3-ruby/releases)
- [Changelog](https://github.com/sparklemotion/sqlite3-ruby/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/sqlite3-ruby@v1.6.8...v1.6.9)

---
updated-dependencies:
- dependency-name: sqlite3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

graph-sample/Gemfile.lock

@@ -247,7 +247,7 @@ GEM
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
-    sqlite3 (1.6.8-x86_64-linux)
+    sqlite3 (1.6.9-x86_64-linux)
     stimulus-rails (1.3.0)
       railties (>= 6.0.0)
     stringio (3.0.9)