feat: bump symbolic to 5.7.8 (#11419)

requirements-base.txt

@@ -63,7 +63,7 @@ sqlparse>=0.1.16,<0.2.0
 statsd>=3.1.0,<3.2.0
 strict-rfc3339>=0.7
 structlog==16.1.0
-symbolic>=5.7.6,<6.0.0
+symbolic>=5.7.8,<6.0.0
 toronado>=0.0.11,<0.1.0
 ua-parser>=0.6.1,<0.8.0
 # for bitbucket client