504 when trying to create a Pull Request

**Describe the bug**
I am trying to open a pull request in a data repository on your LMU-hosted public Gogs instance. The repository is growing larger, the changes I am trying to merge affect 148 annexed files of ~1GB each, 15 of which are newly added and were not in the target branch before, and 148 plain text files of ~1MB each, which are tracked using git, and 15 of which are newly added, too. I keep getting a 504 Gateway Time-out when I try and open a pull request for these changes. Opening a pull request affecting 133 annexed and 133 git files one month ago took some time but did not result in a time-out.

**Gogs version and commit**
LMU-hosted public Gogs