Use renamed property for snapshot name

`snapshot.name_template` has been replaced by
`snapshot.version_template` as of GoReleaser 2.2
(https://goreleaser.com/deprecations/#snapshotname_template).

.goreleaser.yml

@@ -59,6 +59,6 @@ release:
   prerelease: auto
 
 snapshot:
-  name_template: '{{ incpatch .Version }}-snapshot{{ replace (replace .Date ":" "") "-" "" }}+g{{ .ShortCommit }}'
+  version_template: '{{ incpatch .Version }}-snapshot{{ replace (replace .Date ":" "") "-" "" }}+g{{ .ShortCommit }}'
 
 # vim: set sw=2 sts=2 et :