v2.12 Initial work on Archivematica accession numbers

This needs to land before any subsequent work on Archivematica accession numbers, as processors need to create accession numbers in prod so existing theses won't be rendered invalid.

What's Changed

• Allow thesis processors to assign accession numbers to degree periods by @jazairi in #1214
• Update dependencies by @jazairi in #1223
• Update aws-sdk-s3 1.134.0 → 1.135.0 (minor) by @depfu in #1224

Full Changelog: v2.11...v2.12