Bump go version to 1.14.15 and golangci-lint to 1.39

Dockerfile.dapper

@@ -26,10 +26,10 @@ RUN curl -sLf https://github.com/rancher/machine/releases/download/${CATTLE_MACH
 ENV GOLANG_ARCH_amd64=amd64 GOLANG_ARCH_arm=armv6l GOLANG_ARCH_arm64=arm64 GOLANG_ARCH=GOLANG_ARCH_${ARCH} \
     GOPATH=/go PATH=/go/bin:/usr/local/go/bin:${PATH} SHELL=/bin/bash
 
-RUN wget -O - https://storage.googleapis.com/golang/go1.14.12.linux-${!GOLANG_ARCH}.tar.gz | tar -xzf - -C /usr/local
+RUN wget -O - https://storage.googleapis.com/golang/go1.14.15.linux-${!GOLANG_ARCH}.tar.gz | tar -xzf - -C /usr/local
 
 RUN if [ "${ARCH}" == "amd64" ]; then \
-    curl -sL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.27.0; \
+    curl -sL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.39.0; \
     fi
 
 ENV DOCKER_URL_amd64=https://get.docker.com/builds/Linux/x86_64/docker-1.10.3 \