build(deps): Bump golang.org/x/net from 0.5.0 to 0.7.0

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.5.0 to 0.7.0.
- [Release notes](https://github.com/golang/net/releases)
- [Commits](https://github.com/golang/net/compare/v0.5.0...v0.7.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/golang.org/x/sys/unix/xattr_bsd.go

@@ -36,9 +36,14 @@ func xattrnamespace(fullattr string) (ns int, attr string, err error) {
 func initxattrdest(dest []byte, idx int) (d unsafe.Pointer) {
 	if len(dest) > idx {
 		return unsafe.Pointer(&dest[idx])
-	} else {
-		return unsafe.Pointer(_zero)
 	}
+	if dest != nil {
+		// extattr_get_file and extattr_list_file treat NULL differently from
+		// a non-NULL pointer of length zero. Preserve the property of nilness,
+		// even if we can't use dest directly.
+		return unsafe.Pointer(&_zero)
+	}
+	return nil
 }
 
 // FreeBSD and NetBSD implement their own syscalls to handle extended attributes