dependabot: PRs for grouped updates are not created

[tarasmadan]

Describe the bug
We have the dependabot logs now. https://github.com/google/syzkaller/actions/runs/11686366201/job/32541956757 for example.
According to the log, dependabot is able to enumerate updated and group them:

updater | 2024/11/05 14:39:24 INFO <job_912178171> Finished job processing
updater | 2024/11/05 14:39:24 INFO Results:
+------------------------------------------------------------------------------------------------------------------------------------+
|                                                Changes to Dependabot Pull Requests                                                 |
+---------+--------------------------------------------------------------------------------------------------------------------------+
| created | cloud.google.com/go ( from 0.115.1 to 0.116.0 ), cloud.google.com/go/batch ( from 1.11.0 to 1.11.2 ), cloud.google.co... |
+---------+--------------------------------------------------------------------------------------------------------------------------+

The problems:

1. It doesn't create the PR.
2. There is just one "created" line. It seems exclusion list doest't work. It should probably be addressed later.

To Reproduce
Trigger dependency update, check result.

Expected behavior
I expect to see multiple PRs created.

Additional context
dependabot/dependabot-core#10280 looks somehow similar.

[tarasmadan]

dependabot/dependabot-core#7223 looks very relevant.

[tarasmadan]

The log looks green once run is finished.
In ~1 hour the status changes to Errored with the message "Dependabot failed to create a pull request"

Screenshoot:

[tarasmadan]

It is not about grouped updates only. Regular updates aren't created too now.

[wfelipeagudelo]

Can confirm same issue on our side

updater | 2024/11/19 15***15***20 INFO Results***
+------------------------------------------------------------------------------------------------------------------------------------+
|                                                Changes to Dependabot Pull Requests                                                 |
+---------+--------------------------------------------------------------------------------------------------------------------------+
| created | pandera ( from 0.20.4 to 0.21.0 ), deprecated ( from 1.2.14 to 1.2.15 ), sqlparse ( from 0.5.1 to 0.5.2 ), fastapi ( ... |
| created | numpy ( from 1.26.4 to 2.0.2 )                                                                                           |
| created | pandas ( from 2.0.3 to 2.2.3 )                                                                                           |
| created | pymongo ( from 3.13.0 to 4.10.1 )                                                                                        |
| created | sqlalchemy ( from 1.4.54 to 2.0.36 )                                                                                     |
| created | typer ( from 0.13.0 to 0.13.1 ), aiohttp ( from 3.10.10 to 3.11.4 ), kaleido ( from 0.2.1 to 0.4.2 ), blpapi ( from 3... |
+---------+--------------------------------------------------------------------------------------------------------------------------+

It shows created but 0 PRs are created or updated...