Bump r2dbc-postgresql from 0.8.3.RELEASE to 0.8.4.RELEASE in /modules/postgresql (#3035)
Bump r2dbc-postgresql from 0.8.3.RELEASE to 0.8.4.RELEASE in /modules/postgresql (#3035)

Bumps [r2dbc-postgresql](https://github.com/r2dbc/r2dbc-postgresql) from 0.8.3.RELEASE to 0.8.4.RELEASE.
- [Release notes](https://github.com/r2dbc/r2dbc-postgresql/releases)
- [Changelog](https://github.com/pgjdbc/r2dbc-postgresql/blob/v0.8.4.RELEASE/CHANGELOG)
- [Commits](https://github.com/r2dbc/r2dbc-postgresql/compare/v0.8.3.RELEASE...v0.8.4.RELEASE)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
Co-authored-by: Richard North <39063181cb36256cba7d1d358fd239e3b24c2640@gmail.com>
outofcoffee/testcontainers-java,rnorth/test-containers,rnorth/test-containers,rnorth/test-containers,outofcoffee/testcontainers-java,testcontainers/testcontainers-java,testcontainers/testcontainers-java,testcontainers/testcontainers-java,outofcoffee/testcontainers-java