Update "org.osgi.core" dependency from one published in 2009 to something newer

[cowtowncoder]

(note: follow up on #110 )

Currently (Woodstox 6.2) minor OSGi-core dependency is to:

https://mvnrepository.com/artifact/org.apache.felix/org.osgi.core

version 1.4.0 from September 2009. It'd make sense to upgrade to a later version, skipping intermediate (https://mvnrepository.com/artifact/org.osgi/org.osgi.core -- released between 2009 and 2014) right to:

https://mvnrepository.com/artifact/org.osgi/osgi.core

with releases 4.0.0 (Nov 2016) to 8.0.0 (Dec 2020); perhaps using 7.0.0..

[cowtowncoder]

Resolved by #151, moved from:

Old:

  <groupId>org.apache.felix</groupId>
  <artifactId>org.osgi.core</artifactId>
  <version>1.4.0</version>

to new:

  <groupId>org.osgi</groupId>
  <artifactId>osgi.core</artifactId>
  <version>5.0.0</version>