Resolve itest runbundles for Gson and Commons Lang upgrades and fix JsonParser deprecations (#10345)

* Resolve itest runbundles for Gson and Commons Lang upgrades
* Fix JsonParser deprecations too
* Fix feature verification

Signed-off-by: Wouter Born <github@maindrain.net>

itests/org.openhab.binding.feed.tests/itest.bndrun

@@ -20,7 +20,6 @@ Fragment-Host: org.openhab.binding.feed
 # done
 #
 -runbundles: \
-	com.google.gson;version='[2.8.2,2.8.3)',\
 	javax.measure.unit-api;version='[1.0.0,1.0.1)',\
 	org.apache.felix.scr;version='[2.1.10,2.1.11)',\
 	org.osgi.service.event;version='[1.4.0,1.4.1)',\
@@ -71,4 +70,5 @@ Fragment-Host: org.openhab.binding.feed
 	junit-platform-engine;version='[1.7.0,1.7.1)',\
 	junit-platform-launcher;version='[1.7.0,1.7.1)',\
 	org.glassfish.hk2.osgi-resource-locator;version='[1.0.3,1.0.4)',\
-	biz.aQute.tester.junit-platform;version='[5.3.0,5.3.1)'
+	biz.aQute.tester.junit-platform;version='[5.3.0,5.3.1)',\
+	com.google.gson;version='[2.8.6,2.8.7)'