Fix Elixir 1.19 and OTP 28 compatibility

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: khamilowicz

.gitignore

@@ -179,3 +179,6 @@ $RECYCLE.BIN/
 *.lnk
 
 # End of https://www.gitignore.io/api/c,vim,linux,macos,elixir,windows,visualstudiocode
+
+# Dialyzer PLT cache
+/priv/plts/

mix.exs

@@ -37,15 +37,16 @@ defmodule Membrane.File.Plugin.Mixfile do
       # Testing
       {:mox, "~> 1.0", only: :test},
       # Development
-      {:ex_doc, "~> 0.28", only: :dev, runtime: false},
-      {:credo, "~> 1.6", only: :dev, runtime: false},
-      {:dialyxir, "~> 1.1", only: :dev, runtime: false}
+      {:ex_doc, "~> 0.34", only: :dev, runtime: false},
+      {:credo, "~> 1.7", only: :dev, runtime: false},
+      {:dialyxir, "~> 1.4", only: :dev, runtime: false}
     ]
   end
 
   defp dialyzer() do
     opts = [
-      flags: [:error_handling]
+      flags: [:error_handling],
+      plt_add_apps: [:syntax_tools]
     ]
 
     if System.get_env("CI") == "true" do