Remove outdated vendor information. (#7676)

Author: simitt

vendor/vendor.json

@@ -495,12 +495,6 @@
 			"version": "v0.0.4",
 			"versionExact": "v0.0.4"
 		},
-		{
-			"path": "github.com/elastic/go-structform/internal/ubjson",
-			"revision": "v0.0.4",
-			"version": "v0.0.4",
-			"versionExact": "v0.0.4"
-		},
 		{
 			"checksumSHA1": "s7k0vEuuqkoPXU0FtrD6Y0jxd7U=",
 			"path": "github.com/elastic/go-structform/internal/unsafe",
@@ -509,12 +503,6 @@
 			"version": "v0.0.4",
 			"versionExact": "v0.0.4"
 		},
-		{
-			"path": "github.com/elastic/go-structform/internal/visitors",
-			"revision": "v0.0.4",
-			"version": "v0.0.4",
-			"versionExact": "v0.0.4"
-		},
 		{
 			"checksumSHA1": "KTDpLMZRFtSVeUuXdaz5o5ehzfI=",
 			"path": "github.com/elastic/go-structform/json",