in PR #47 gpsoauth was bumped to 1.0.0.
This caused an installation failure as gpsoauth PR https://github.com/simon-weber/gpsoauth/pull/31 set the minimum python version as 3.8 and this docker image is only 3.7.
This PR is to roll back the version to the last version supported by python 3.7 (0.4.3).
Trying to search Mopidy-YouTube gives the following error:
```
ERROR 2021-12-15 23:44:32,572 [7:YouTubeBackend-3] mopidy_youtube,
search error "Extra data: line 1 column 280618 (char 280617)",
WARNING 2021-12-15 23:44:32,573 [7:Core-9] mopidy.core.library,
YouTubeBackend does not implement library.search() with "exact" support. Please upgrade it.
```
current pinned version is 3.3, updating to version 3.4 fixes this.
