Bump sql-metadata from 2.14.0 to 2.15.0

Bumps [sql-metadata](https://github.com/macbre/sql-metadata) from 2.14.0 to 2.15.0.
- [Release notes](https://github.com/macbre/sql-metadata/releases)
- [Commits](macbre/sql-metadata@v2.14.0...v2.15.0)

---
updated-dependencies:
- dependency-name: sql-metadata
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

setup.py

@@ -61,7 +61,7 @@
         'docopt==0.6.2',
         'PyYAML==6.0.2',
         'mysqlclient==2.2.6',
-        'sql_metadata==2.14.0',
+        'sql_metadata==2.15.0',
         'termcolor==2.4.0',
         'yamlordereddictloader==0.4.2'
     ],