Bump mysql-connector-python from 8.0.27 to 8.0.28 in /Backend

Bumps [mysql-connector-python](http://dev.mysql.com/doc/connector-python/en/index.html) from 8.0.27 to 8.0.28.

---
updated-dependencies:
- dependency-name: mysql-connector-python
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Backend/requirements.txt

@@ -5,7 +5,7 @@ Flask-Cors==3.0.10
 pyodbc==4.0.32
 requests==2.27.1
 uuid==1.30
-mysql-connector-python==8.0.27
+mysql-connector-python==8.0.28
 cryptography==36.0.1
 pycryptodome==3.11.0
 Wand==0.6.7