Stop managing version of therapi-runtime-javadoc

The only project I know of in the SciJava ecosystem that was
using it is scijava-ops. And that project ended up implementing
its own more targeted javadoc annotation processor.

pom.xml

@@ -2309,10 +2309,6 @@
 		<org.tensorflow.libtensorflow_jni_gpu.version>${libtensorflow_jni_gpu.version}</org.tensorflow.libtensorflow_jni_gpu.version>
 		<org.tensorflow.proto.version>${proto.version}</org.tensorflow.proto.version>
 
-		<!-- Therapi Runtime Javadoc - https://github.com/dnault/therapi-runtime-javadoc -->
-		<!-- NB: therapi.version is defined in pom-scijava-base. -->
-		<com.github.therapi.therapi-runtime-javadoc.version>${therapi.version}</com.github.therapi.therapi-runtime-javadoc.version>
-
 		<!-- ThreeTen - https://www.threeten.org/ -->
 		<threetenbp.version>1.6.8</threetenbp.version>
 		<org.threeten.threetenbp.version>${threetenbp.version}</org.threeten.threetenbp.version>
@@ -6543,13 +6539,6 @@
 				<version>${org.tensorflow.proto.version}</version>
 			</dependency>
 
-			<!-- Therapi Runtime Javadoc - https://github.com/dnault/therapi-runtime-javadoc -->
-			<dependency>
-				<groupId>com.github.therapi</groupId>
-				<artifactId>therapi-runtime-javadoc</artifactId>
-				<version>${com.github.therapi.therapi-runtime-javadoc.version}</version>
-			</dependency>
-
 			<!-- ThreeTen - https://www.threeten.org/ -->
 			<dependency>
 				<groupId>org.threeten</groupId>