cob_common: 0.5.3-0 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `cob_common` to `0.5.3-0`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.2`
- previous version for package: `0.5.2-2`

## brics_actuator

- No changes

## cob_common

- No changes

## cob_description

```
* reminder comment ;-)
* ee_link is now back in ur_description
* Contributors: ipa-fxm
```

## cob_srvs

```
* merge
* add new service
* Contributors: Florian Weisshardt
```

## desire_description

- No changes

## raw_description

- No changes