Bug 573454 - Missing requirement for org.slf4j in 2021-06 M2

Change-Id: I194042e19560a1b3a2a41228ce20fe2275176784
Signed-off-by: Sravan Kumar Lakkimsetti <sravankumarl@in.ibm.com>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.releng/+/181770
Tested-by: Platform Bot <platform-bot@eclipse.org>
diff --git a/features/org.eclipse.help-feature/feature.xml b/features/org.eclipse.help-feature/feature.xml
index dfa3962..301f975 100644
--- a/features/org.eclipse.help-feature/feature.xml
+++ b/features/org.eclipse.help-feature/feature.xml
@@ -190,6 +190,13 @@
          unpack="false"/>
 
    <plugin
+         id="org.slf4j.api"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+
+   <plugin
          id="org.eclipse.core.net"
          download-size="0"
          install-size="0"