mix.exs: Append .git to git repo URLs

Closes: #1980

mix.exs

@@ -151,12 +151,13 @@ defp deps do
       {:credo, "~> 1.1.0", only: [:dev, :test], runtime: false},
       {:mock, "~> 0.3.3", only: :test},
       {:crypt,
-       git: "https://github.com/msantos/crypt", ref: "f63a705f92c26955977ee62a313012e309a4d77a"},
+       git: "https://github.com/msantos/crypt.git",
+       ref: "f63a705f92c26955977ee62a313012e309a4d77a"},
       {:cors_plug, "~> 1.5"},
       {:ex_doc, "~> 0.21", only: :dev, runtime: false},
       {:web_push_encryption, "~> 0.2.1"},
       {:swoosh,
-       git: "https://github.com/swoosh/swoosh",
+       git: "https://github.com/swoosh/swoosh.git",
        ref: "c96e0ca8a00d8f211ec1f042a4626b09f249caa5",
        override: true},
       {:phoenix_swoosh, "~> 0.2"},
@@ -190,7 +191,7 @@ defp deps do
       {:excoveralls, "~> 0.12.1", only: :test},
       {:flake_id, "~> 0.1.0"},
       {:concurrent_limiter,
-       git: "https://git.pleroma.social/pleroma/elixir-libraries/concurrent_limiter",
+       git: "https://git.pleroma.social/pleroma/elixir-libraries/concurrent_limiter.git",
        ref: "8eee96c6ba39b9286ec44c51c52d9f2758951365"},
       {:remote_ip,
        git: "https://git.pleroma.social/pleroma/remote_ip.git",