Fix the upgrade test for pg_jwt by adding the database name (#10738)

## Problem
The upgrade test for pg_jwt does not work correctly.
## Summary of changes
The script for the upgrade test is modified to use the database
`contrib_regression`.

docker-compose/ext-src/pgjwt-src/test-upgrade.sh

@@ -2,4 +2,4 @@
 set -ex
 cd "$(dirname ${0})"
 patch -p1 <test-upgrade.patch
-pg_prove test.sql
+pg_prove -d contrib_regression test.sql