updated Dockerfile

Dockerfile.cosmwasm

@@ -16,7 +16,7 @@
 #
 # To exit the bash, just execute
 # > exit
-FROM golang:1.20-alpine AS builder
+FROM golang:1.21.5-alpine3.18 AS builder
 RUN apk update && apk add --no-cache make git
 WORKDIR /go/src/github.com/forbole/bdjuno
 COPY . ./