deps: add nghttp3/**/.deps to .gitignore

PR-URL: #51400
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Marco Ippolito <[email protected]>

Author: lpinca

deps/ngtcp2/.gitignore

@@ -6,3 +6,4 @@ Makefile
 *gnutls*
 ngtcp2/**/.gitignore
 ngtcp2/**/.deps
+nghttp3/**/.deps