Update Jester to use latest httpbeast (#6979)

frameworks/Nim/jester/techempower.nimble

@@ -13,5 +13,5 @@ skipExt = @["nim"]
 requires "nim >= 1.0.0"
 
 # We lock dependencies here on purpose.
-requires "httpbeast#v0.2.2"
+requires "httpbeast#v0.4.0"
 requires "jester 0.5.0"