Update Solr Ingester connector to ingest Solr 9 documents.

[guylaine-bassette]

The Solr Ingestor needed a little fix to ingest Solr 9 documents. The "httpmime" dependency was missing from the distribution packaging. With Solr 9, a bug in Date field filling was discovered and fixed. We are using it in our application.

We are currently using these fixes in our application.

I have run "ant test" and all passed except for elasticsearch IT-HSQLDB tests. I get back up until 2.25 and they were already showing the same failures.

[OpenPj]

Thank you @guylaine-bassette for your contribution, we will consider this for ManifoldCF 2.28 because we don't want to apply any changes to the base code for 2.27 release, this due to the drastic change in the release process.

I have just created another ticket for this: https://issues.apache.org/jira/browse/CONNECTORS-1760