New upstream version 0.9.4

.github/release-drafter.yml

.github/workflows/CI.yml

.github/workflows/release-drafter.yml

README.md

RELEASE_NOTES.md

build.sbt

msgpack-jackson/README.md

...ava/org/msgpack/jackson/dataformat/MessagePackMapper.java

.../msgpack/jackson/dataformat/TimestampExtensionModule.java

...org/msgpack/jackson/dataformat/MessagePackMapperTest.java

...pack/jackson/dataformat/TimestampExtensionModuleTest.java

...benchmark/MessagePackDataformatHugeDataBenchmarkTest.java

project/build.properties

project/plugins.sbt

sbt