Drop go 1.16

Require go 1.17 from now on, since go 1.16 is no longer supported.
Drop go1.16 compatibility.

NOTE we also have to install go 1.18 from Vagrantfile, because
Fedora 35 comes with Go 1.16.x which can't be used.

Note the changes to go.mod and vendor are due to
https://go.dev/doc/go1.17#tools

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

go.mod

@@ -1,6 +1,6 @@
 module github.com/opencontainers/runc
 
-go 1.16
+go 1.17
 
 require (
 	github.com/checkpoint-restore/go-criu/v5 v5.3.0
@@ -24,3 +24,10 @@ require (
 	golang.org/x/sys v0.0.0-20211116061358-0a5406a5449c
 	google.golang.org/protobuf v1.27.1
 )
+
+require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect
+	github.com/russross/blackfriday/v2 v2.0.1 // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df // indirect
+)