Enable OpenNLP in ApiCheck (diffs against 8.2.0)

lucene-analyzers-opennlp was excluded because it has no 4.8.1 release: the
module was added to upstream Lucene long after 4.8, and Maven Central's
earliest published version is 7.3.0. The Lucene.Net.Analysis.OpenNLP assembly
is therefore mapped to 8.2.0 (via its LuceneMavenMapping) rather than 4.8.1
like every other module.

The scan now runs cleanly against 8.2.0 (16 types matched, 0 type-level gaps,
only a handful of member diffs), so enable it for coverage. Note its baseline
is a newer API generation than the rest of the report.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: paulirwin

apicheck-config.jsonc

@@ -17,13 +17,12 @@
                 "org.carrot2:morfologik-polish:1.7.1"
             ]
         },
-// OpenNLP not currently supported due to version difference
-//        {
-//            "luceneNetName": "Lucene.Net.Analysis.OpenNLP",
-//            "mavenDependencies": [
-//                "org.apache.opennlp:opennlp-tools:1.9.1",
-//            ]
-//        },
+        {
+            "luceneNetName": "Lucene.Net.Analysis.OpenNLP",
+            "mavenDependencies": [
+                "org.apache.opennlp:opennlp-tools:1.9.1",
+            ]
+        },
         {
             "luceneNetName": "Lucene.Net.Analysis.Phonetic",
         },