Make taxonomy identification case insensitive

This fixes a bug where gene identifiers and taxonomy IDs are not parsed correctly due to casing inconsistency in the original source data.

gnormplus.py

@@ -100,7 +100,7 @@ class GnormplusDataset(datasets.GeneratorBasedBuilder):
 
     DEFAULT_CONFIG_NAME = "gnormplus_source"
 
-    _re_tax_id = re.compile(r"(?P<db_id>\d+)\(Tax:(?P<tax_id>\d+)\)")
+    _re_tax_id = re.compile(r"(?P<db_id>\d+)\([tT]ax:(?P<tax_id>\d+)\)")
 
     def _info(self) -> datasets.DatasetInfo:
         if self.config.schema == "source":