Update bnd to 5.2.0 (openhab#9785)

See: https://github.com/bndtools/bnd/wiki/Changes-in-5.2.0

Signed-off-by: Wouter Born <github@maindrain.net>
Signed-off-by: John Marshall <john.marshall.au@gmail.com>

pom.xml

@@ -69,7 +69,7 @@
     <maven.compiler.compilerVersion>${oh.java.version}</maven.compiler.compilerVersion>
 
     <ohc.version>3.1.0-SNAPSHOT</ohc.version>
-    <bnd.version>5.1.2</bnd.version>
+    <bnd.version>5.2.0</bnd.version>
     <karaf.version>4.2.7</karaf.version>
     <sat.version>0.10.0</sat.version>
     <slf4j.version>1.7.21</slf4j.version>
@@ -152,6 +152,7 @@ Import-Package: \\
   !*.impl.*, \\
   org.openhab.*, \\
   ${bnd.exportpackage}
+-noimportjava: true
 -sources: false
 -contract: *
 -includeresource: ${bnd.includeresource}