Update akka-http-json4s dependency

[pm47]

Fixes:

021-07-19 12:03:13,504 WARN  akka.util.ManifestInfo - You are using version 10.2.4 of Akka HTTP, but it appears you (perhaps indirectly) also depend on older versions of related artifacts. You can solve this by adding an explicit dependency on version 10.2.4 of the [akka-http] artifacts to your project. Here's a complete collection of detected artifacts: (10.2.0, [akka-http]), (10.2.4, [akka-http-core, akka-parsing]). See also: https://doc.akka.io/docs/akka/current/common/binary-compatibility-rules.html#mixed-versioning-is-not-allowed

[t-bast]

[codecov-commenter]

Codecov Report

Merging #1889 (8eed3c6) into master (3f1c250) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1889      +/-   ##
==========================================
- Coverage   87.30%   87.29%   -0.01%     
==========================================
  Files         159      159              
  Lines       11995    11995              
  Branches      459      459              
==========================================
- Hits        10472    10471       -1     
- Misses       1523     1524       +1     

Impacted Files	Coverage Δ
...main/scala/fr/acinq/eclair/router/Validation.scala	90.76% <0.00%> (-1.54%)	⬇️
...clair/channel/publish/ReplaceableTxPublisher.scala	85.79% <0.00%> (-1.19%)	⬇️
...cala/fr/acinq/eclair/payment/relay/NodeRelay.scala	97.63% <0.00%> (+1.57%)	⬆️
...clair/blockchain/bitcoind/rpc/BatchingClient.scala	100.00% <0.00%> (+13.63%)	⬆️