Post release 1.4.0: Update version to 1.4.0.dev0#3

harrryr wants to merge 2 commits intomainharrryr/aws-otel-dotnet-instrumentation:mainfrom

prepare-main-for-next-dev-cycle-1.4.0harrryr/aws-otel-dotnet-instrumentation:prepare-main-for-next-dev-cycle-1.4.0Copy head branch name to clipboard