Adding okio dependency for r4b structures for running DIST profile

[markiantorno]

DIST profile fails with error cannot resolve dependency okio.

[codecov]

Codecov Report

Base: 81.00% // Head: 81.14% // Increases project coverage by +0.14% 🎉

Coverage data is based on head (a868a94) compared to base (02944ba).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4275      +/-   ##
============================================
+ Coverage     81.00%   81.14%   +0.14%     
- Complexity    23466    23480      +14     
============================================
  Files          1446     1438       -8     
  Lines         86175    86068     -107     
  Branches      11798    11747      -51     
============================================
+ Hits          69809    69843      +34     
+ Misses        11087    10994      -93     
+ Partials       5279     5231      -48     

Impacted Files	Coverage Δ
...ir/jpa/provider/r4/BaseResourceProviderR4Test.java	0.00% <0.00%> (-95.32%)	⬇️
...uhn/fhir/jpa/term/config/TermCodeSystemConfig.java	75.00% <0.00%> (-25.00%)	⬇️
...bscription/channel/impl/LinkedBlockingChannel.java	72.72% <0.00%> (-17.28%)	⬇️
ca/uhn/fhir/jpa/test/config/TestJPAConfig.java	87.50% <0.00%> (-12.50%)	⬇️
ca/uhn/fhir/jpa/provider/BaseJpaProvider.java	52.54% <0.00%> (-7.81%)	⬇️
ca/uhn/fhir/util/ThreadPoolUtil.java	93.33% <0.00%> (-6.67%)	⬇️
...terceptor/SubscriptionSubmitInterceptorLoader.java	94.44% <0.00%> (-5.56%)	⬇️
ca/uhn/fhir/jpa/model/entity/ForcedId.java	95.23% <0.00%> (-4.77%)	⬇️
ca/uhn/fhir/jpa/util/MemoryCacheService.java	84.61% <0.00%> (-3.69%)	⬇️
...searchparam/extractor/SearchParamExtractorR4B.java	59.52% <0.00%> (-2.70%)	⬇️
... and 102 more

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