chore: update lockfile with latest gax fork commit

mix.lock

@@ -54,7 +54,7 @@
   "global_flags": {:hex, :global_flags, "1.0.0", "ee6b864979a1fb38d1fbc67838565644baf632212bce864adca21042df036433", [:rebar3], [], "hexpm", "85d944cecd0f8f96b20ce70b5b16ebccedfcd25e744376b131e89ce61ba93176"},
   "google_api_big_query": {:hex, :google_api_big_query, "0.79.0", "a4800c699932879a39a7098f04bc7a659c2a1745399867f5b688233d38f3fd86", [:mix], [{:google_gax, "~> 0.4", [hex: :google_gax, repo: "hexpm", optional: false]}], "hexpm", "6b4102c5aa74f31310a022066151d2f974b1ed26ee250571beec22b0be9a9cb2"},
   "google_api_cloud_resource_manager": {:hex, :google_api_cloud_resource_manager, "0.34.3", "9e0ffa89b895a77a9fac1fa51f92d06f690b32002224281098be500322988680", [:mix], [{:google_gax, "~> 0.4", [hex: :google_gax, repo: "hexpm", optional: false]}], "hexpm", "de1aee529a9ce424ef93b97bdffc50a1b589fb206ee3866bbd23329eb4df43f2"},
-  "google_gax": {:git, "https://github.com/Logflare/elixir-google-gax.git", "ffa439b8bc8687af68e96632bd7e626dcd272f5f", []},
+  "google_gax": {:git, "https://github.com/Logflare/elixir-google-gax.git", "6772193c438dd72ac253ea34ab13e9c02842cba8", [ref: "6772193"]},
   "goth": {:hex, :goth, "1.4.2", "a598dfbce6fe65db3f5f43b1ab2ce8fbe3b2fe20a7569ad62d71c11c0ddc3f41", [:mix], [{:finch, "~> 0.9", [hex: :finch, repo: "hexpm", optional: false]}, {:jason, "~> 1.1", [hex: :jason, repo: "hexpm", optional: false]}, {:jose, "~> 1.11", [hex: :jose, repo: "hexpm", optional: false]}], "hexpm", "d51bb6544dc551fe5754ab72e6cf194120b3c06d924282aaa3321a516ed3b98a"},
   "gproc": {:hex, :gproc, "0.9.1", "f1df0364423539cf0b80e8201c8b1839e229e5f9b3ccb944c5834626998f5b8c", [:rebar3], [], "hexpm", "905088e32e72127ed9466f0bac0d8e65704ca5e73ee5a62cb073c3117916d507"},
   "grpc": {:hex, :grpc, "0.5.0", "a44cb306625a52fa31a2189ce91b40d24e82569568f0cc214c1e1e0faf54f58a", [:mix], [{:cowboy, "~> 2.9", [hex: :cowboy, repo: "hexpm", optional: false]}, {:cowlib, "~> 2.11", [hex: :cowlib, repo: "hexpm", optional: false]}, {:gun, "~> 2.0.1", [hex: :grpc_gun, repo: "hexpm", optional: false]}], "hexpm", "17b98593fdb1a65be7b2722821266627b3f2fba29bbbd7d0945389427c0d0d5f"},