Refresh app reference when needed

[vigoo]

Resolves #2003

[codecov-commenter]

Codecov Report

Base: 62.57% // Head: 62.51% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (a999dcf) compared to base (b2c84ec).
Patch coverage: 90.90% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2004      +/-   ##
==========================================
- Coverage   62.57%   62.51%   -0.06%     
==========================================
  Files         204      204              
  Lines        6046     6040       -6     
  Branches      224      226       +2     
==========================================
- Hits         3783     3776       -7     
- Misses       2263     2264       +1     

Impacted Files	Coverage Δ
...a/zio/http/netty/server/ServerInboundHandler.scala	86.20% <88.88%> (+0.22%)	⬆️
...main/scala/zio/http/netty/server/NettyDriver.scala	100.00% <100.00%> (ø)

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