bump go.mod to Go 1.19 and run go fix

web3-bot · rvagg · commit 904803be0694 · 2023-02-09T15:25:21.000+11:00
diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module github.com/filecoin-project/go-amt-ipld/v4
 
-go 1.18
+go 1.19
 
 require (
 	github.com/ipfs/go-block-format v0.0.2
