Update to RDF 1.2 and Jena 5.4+

[Ostrzyciel]

Currently we are stuck with Jena 5.3, because 5.4 dropped support for RDF-star in favor of RDF 1.2. The two are not compatible with each other, so we can't simply switch to RDF 1.2 right now, as that would break a ton of things, like conformance tests where jelly-cli is used heavily.

To do this, we need:

• The W3C to finish RDF 1.2 (candidate recommendation status or something like this).
• Jelly to get full support for RDF 1.2.
• And us to figure out a sensible migration path.

[Ostrzyciel]

When doing this, remove scala steward ignore rule for Jena.

[niegrzybkowski]

Full RDF 1.2 support will probably require a protocol release as well, since graphs can now be triple terms