Remove PostgreSQL image workaround

Removes workaround for a failure reported in
quarkus-qe/quarkus-test-framework#641 and
observed in #971.

pom.xml

@@ -226,8 +226,6 @@
                                 <ts.global.s2i.quarkus.native.builder.image>${ts.global.s2i.quarkus.native.builder.image}</ts.global.s2i.quarkus.native.builder.image>
                                 <!-- Services used in test suite -->
                                 <postgresql.latest.image>${postgresql.latest.image}</postgresql.latest.image>
-                                <!-- FIXME: if the same image name is used in two test classes, the second one fails -->
-                                <postgresql.also.latest.image>docker.io/library/postgres:15.1</postgresql.also.latest.image>
                                 <!-- TODO: investigate further in https://github.com/quarkus-qe/quarkus-test-suite/issues/627 -->
                                 <elastic.71.image>docker.io/bitnami/elasticsearch:7.17.6</elastic.71.image>
                                 <!--TODO change into 5.7 when this fixed https://github.com/docker-library/mysql/issues/844 -->

sql-db/sql-app/src/test/java/io/quarkus/ts/sqldb/sqlapp/XAPostgresIT.java

@@ -11,7 +11,7 @@ public class XAPostgresIT extends AbstractSqlDatabaseIT {
 
     static final int POSTGRESQL_PORT = 5432;
 
-    @Container(image = "${postgresql.also.latest.image}", port = POSTGRESQL_PORT, expectedLog = "listening on IPv4 address")
+    @Container(image = "${postgresql.latest.image}", port = POSTGRESQL_PORT, expectedLog = "listening on IPv4 address")
     static PostgresqlService database = new PostgresqlService()
             .withUser("user")
             .withPassword("user")