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.

healthcheck/go.mod

@@ -4,8 +4,13 @@ go 1.16
 
 require (
 	github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f
+	github.com/kr/pretty v0.3.0 // indirect
 	github.com/lightningnetwork/lnd/ticker v1.1.0
 	github.com/lightningnetwork/lnd/tor v1.0.0
-	github.com/stretchr/testify v1.7.0
-	golang.org/x/sys v0.1.0
+	github.com/rogpeppe/go-internal v1.9.0 // indirect
+	github.com/stretchr/testify v1.8.2
+	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/sync v0.2.0 // indirect
+	golang.org/x/sys v0.8.0
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 )