Bump golang from 1.17 to 1.18 in /build (#248)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Luca Comellini <luca.com@gmail.com>

Author: dependabot[bot]

build/Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.4
-FROM golang:1.17 as base
+FROM golang:1.18 as base
 ARG VERSION
 ARG GIT_COMMIT
 ARG DATE