upgraded go version

Schuorz · Schuorz · commit 8dc15faf333e · 2022-05-31T16:00:31.000+02:00
diff --git a/go.mod b/go.mod
@@ -1,3 +1,3 @@
 module github.com/InSitu-Software/spaniel/v2
 
-go 1.12
+go 1.18

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,3 @@`
`1`	`1`	`module github.com/InSitu-Software/spaniel/v2`
`2`	`2`
`3`		`-go 1.12`
	`3`	`+go 1.18`