bnd: Update for 6.0.0 release

[bjhargrave]

We use the new bundle extension for bnd configuration. We also update
the verifyOSGi task to use the new output property to enable
up-to-date builds.

[rotty3000]

LGTM

[szpak]

@rotty3000 I just wanted to ask you about your opinion on that topic. Thanks for your precognition skills ;-).

[bjhargrave]

@rotty3000 Made me make this PR :-)

[szpak]

@rotty3000 Made me make this PR :-)

And everything is clear now :-). I'm glad he organized an another person to help with OSGI in Spock 👍

[rotty3000]

@szpak for future reference, @bjhargrave is the go to w.r.t. OSGi (and pretty much any other programming doubts 😓) you shouldn't need my blessing if he sends a PR cause he's likely improved on anything I would have submitted 😁

[codecov]

Codecov Report

Merging #1377 (d9bafab) into master (6cf09c6) will increase coverage by 0.04%.
The diff coverage is 93.18%.

@@             Coverage Diff              @@
##             master    #1377      +/-   ##
============================================
+ Coverage     79.26%   79.31%   +0.04%     
- Complexity     3950     3966      +16     
============================================
  Files           402      403       +1     
  Lines         12290    12298       +8     
  Branches       1625     1619       -6     
============================================
+ Hits           9742     9754      +12     
+ Misses         1965     1960       -5     
- Partials        583      584       +1     

Impacted Files	Coverage Δ
.../spockframework/runtime/model/IterationFilter.java	91.66% <91.66%> (ø)
...spockframework/runtime/MethodSelectorResolver.java	90.69% <92.85%> (+12.12%)	⬆️
...ework/runtime/PlatformParameterizedSpecRunner.java	77.94% <100.00%> (+0.16%)	⬆️
.../org/spockframework/runtime/model/FeatureInfo.java	98.27% <100.00%> (+0.06%)	⬆️
.../spockframework/builder/CollectionSlotFactory.java	87.50% <0.00%> (-1.39%)	⬇️
...pockframework/mock/runtime/InteractionBuilder.java	86.95% <0.00%> (-0.55%)	⬇️
.../java/org/spockframework/runtime/SpockRuntime.java	70.78% <0.00%> (-0.33%)	⬇️
...n/java/org/spockframework/util/ReflectionUtil.java	80.35% <0.00%> (-0.18%)	⬇️
...spockframework/runtime/ExpressionInfoRenderer.java	92.72% <0.00%> (-0.13%)	⬇️
...k/runtime/FailedSetEqualityComparisonRenderer.java	96.42% <0.00%> (-0.13%)	⬇️
... and 9 more

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