Try to fix Dialyzer error

See jeremyjh/dialyxir#508 (comment)

apps/datagouvfr/mix.exs

@@ -45,7 +45,8 @@ defmodule Datagouvfr.MixProject do
       {:vex, github: "CargoSense/vex", ref: "328a39f7"},
       {:exvcr, "~> 0.13", only: :test},
       {:mox, "~> 1.0.0", only: :test},
-      {:sentry, "~> 8.1"}
+      {:sentry, "~> 8.1"},
+      {:dialyxir, "~> 1.2", only: [:dev, :test], runtime: false},
     ]
   end
 end

apps/gbfs/mix.exs

@@ -51,7 +51,8 @@ defmodule GBFS.MixProject do
       {:mock, "~> 0.3.6", only: :test},
       {:bypass, "~> 2.1", only: :test},
       {:appsignal, "~> 2.0"},
-      {:appsignal_phoenix, "~> 2.0"}
+      {:appsignal_phoenix, "~> 2.0"},
+      {:dialyxir, "~> 1.2", only: [:dev, :test], runtime: false},
     ]
   end
 end

apps/shared/mix.exs

@@ -60,7 +60,8 @@ defmodule Shared.MixProject do
       {:ex_json_schema, "~> 0.10"},
       # added because of `TransportWeb.Plugs.AppSignalFilter`
       {:appsignal, "~> 2.0"},
-      {:appsignal_phoenix, "~> 2.0"}
+      {:appsignal_phoenix, "~> 2.0"},
+      {:dialyxir, "~> 1.2", only: [:dev, :test], runtime: false},
     ]
   end
 end

apps/transport/mix.exs

@@ -130,7 +130,8 @@ defmodule Transport.Mixfile do
       {:ex_phone_number, "~> 0.3"},
       {:appsignal, "~> 2.0"},
       {:appsignal_phoenix, "~> 2.0"},
-      {:vega_lite, "~> 0.1.7"}
+      {:vega_lite, "~> 0.1.7"},
+      {:dialyxir, "~> 1.2", only: [:dev, :test], runtime: false},
     ]
   end
 end

apps/unlock/mix.exs

@@ -52,7 +52,8 @@ defmodule Unlock.MixProject do
       # required for `TransportWeb.Plugs.AppSignalFilter`
       {:shared, in_umbrella: true},
       {:appsignal, "~> 2.0"},
-      {:appsignal_phoenix, "~> 2.0"}
+      {:appsignal_phoenix, "~> 2.0"},
+      {:dialyxir, "~> 1.2", only: [:dev, :test], runtime: false},
     ]
   end
 end