Fix for failed jobs due to transaction deadlocks during indexing

With this release, a fix is being made available which is supposed to circumvent failing jobs due to transaction deadlocks during the indexing process. There is no full fix available for the issue at the moment, but granting multiple attempts to transactions can significantly reduce the amount of failed indexing jobs. More details can be found in #19.

Also noteworthy is that since the last release, a new automated test workflow has been added which runs for pull requests. The details can be found in #18. Although this has no impact on the actual code of the project, it seemed like a good opportunity to bump the minor version as well.