Chore: Lower minimum Go version

sudo-bmitch · sudo-bmitch · commit 579e3469409d · 2025-05-22T10:38:37.000-04:00
This aligns with the upstream go-digest project.

Signed-off-by: Brandon Mitchell &lt;git@bmitch.net&gt;
diff --git a/go.mod b/go.mod
@@ -1,3 +1,3 @@
 module github.com/sudo-bmitch/oci-digest
 
-go 1.23
+go 1.18

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,3 @@`
`1`	`1`	`module github.com/sudo-bmitch/oci-digest`
`2`	`2`
`3`		`-go 1.23`
	`3`	`+go 1.18`