gomod: run go work sync to sync modules

This commit is the result of running `go work sync` and `go mod tidy`
that syncs module versions for all submodules.

tlv/go.mod

@@ -5,7 +5,12 @@ require (
 	github.com/btcsuite/btcd/btcec/v2 v2.1.3
 	github.com/davecgh/go-spew v1.1.1
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1
-	github.com/stretchr/testify v1.7.1
+	github.com/kr/pretty v0.3.0 // indirect
+	github.com/rogpeppe/go-internal v1.9.0 // indirect
+	github.com/stretchr/testify v1.8.2
+	golang.org/x/crypto v0.7.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 )
 
 go 1.16