Bump sql-metadata from 2.7.0 to 2.8.0

Bumps [sql-metadata](https://github.com/macbre/sql-metadata) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/macbre/sql-metadata/releases)
- [Commits](macbre/sql-metadata@v2.7.0...v2.8.0)

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

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

setup.py

@@ -61,7 +61,7 @@
         'docopt==0.6.2',
         'PyYAML==6.0',
         'mysqlclient==2.1.1',
-        'sql_metadata==2.7.0',
+        'sql_metadata==2.8.0',
         'termcolor==2.2.0',
         'yamlordereddictloader==0.4.0'
     ],