Bump minimum Go version required (#14250)

After the auto-vendoring change, minimum Go version
required is 1.14.

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

scripts/prereq-check.sh

@@ -35,7 +35,7 @@ echo "Checking prerequisites"
 
 REQUIREDNODEVERSION=8.9.0
 REQUIREDNPMVERSION=5.6.0
-REQUIREDGOVERSION=1.13.0
+REQUIREDGOVERSION=1.14.0
 REQUIREDDOCKERVERSION=17.0
 
 NODEVERSION=$(sed 's/v//' <<< $(node -v))