Upgrade RDS broker
Upgrade RDS broker

This pins the version of the broker which introduced the ability for
users to run `CREATE SCHEMA`[1][2].

[1] https://github.com/alphagov/paas-rds-broker-boshrelease/pull/45
[2] https://concourse.build.ci.cloudpipeline.digital/teams/main/pipelines/rds-broker-release/jobs/build-final-release/builds/16

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf