Bump sqlite3 from 1.6.7 to 1.6.8

Bumps [sqlite3](https://github.com/sparklemotion/sqlite3-ruby) from 1.6.7 to 1.6.8.
- [Release notes](https://github.com/sparklemotion/sqlite3-ruby/releases)
- [Changelog](https://github.com/sparklemotion/sqlite3-ruby/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/sqlite3-ruby@v1.6.7...v1.6.8)

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

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

Gemfile.lock

@@ -261,7 +261,7 @@ GEM
     spreadsheet (1.3.0)
       ruby-ole
     spring (4.1.1)
-    sqlite3 (1.6.7)
+    sqlite3 (1.6.8)
       mini_portile2 (~> 2.8.0)
     stimulus-rails (1.2.1)
       railties (>= 6.0.0)