POM: pin to ij1-patcher 2.0.0

This release of ij1-patcher improves the HeadlessGenericDialog
to handle null label strings without throwing NullPointerException.

The fix is necessary because starting with ImageJ v1.54k, the
ParticleAnalyzer now uses a trailing null label in its checkbox group:

imagej/ImageJ@ccd0b31#diff-4ae3c0fe91258b8099f1c51de5a3923f4aaf08d90699f6b76d923d0a5fb06944R348-R361

Consequently, only when running headlessly, the testPaulsMacro
integration test failed because the ParticleAnalyzer silently crashed
the executed macro, yielding wrong (and inconsistent!) results.

With this fix in place, Paul's macro once again works as intended.

Author: ctrueden

pom.xml

@@ -180,6 +180,9 @@
 
 		<!-- NB: Deploy releases to the SciJava Maven repository. -->
 		<releaseProfiles>sign,deploy-to-scijava</releaseProfiles>
+
+		<!-- TEMP: Until pom-scijava 42.0.0 is released. -->
+		<ij1-patcher.version>2.0.0</ij1-patcher.version>
 	</properties>
 
 	<repositories>