Update docling and docling-parse dependencies to use docling-parse >= v3

[courtneypacheco]

Background / Context

docling-parse v3.0.0 was released on 9 December 2024 and it contained a large number of breaking changes, namely to its syntax. These syntax changes broke SDG (and therefore some InstructLab logic in general). See relevant issue here: instructlab/instructlab#2765

Furthermore, it appears that the main docling package was updated ~7 hours afterward to use the new docling-parse v3.0.0 release. We can see that the v2.10.0 docling release makes these changes effective.

Current Workaround

To temporarily workaround this issue, I created #434 to force docling-parse>=2.0.0,<3.0.0, and to force docling<=2.8.3. In other words, this change will temporarily ensure we don't use docling-parse's v3's breaking changes either through directly importing docling-parse or indirectly through docling.

Goals

We eventually want to migrate to the newer v3 syntax so that we can utilize newer versions and newer functionality, as more is added.

[dmartinol]

One more point in favor of upgrading the docling dependency.
We want to integrate the docling-haystack package in instructlab to leverage its Haystack components within the RAG pipelines. However, a dependency conflict is currently preventing us from proceeding with the integration:

    instructlab-sdg 0.6.2 depends on docling<=2.8.3 and >=2.4.2
    docling-haystack 0.1.1 depends on docling<3.0.0 and >=2.9.0

requirements.txt