Update pythonx version references

lib/livebook/runtime/definitions.ex

@@ -506,7 +506,7 @@ defmodule Livebook.Runtime.Definitions do
   def snippet_definitions(), do: @snippet_definitions
 
   def pythonx_dependency() do
-    %{dep: {:pythonx, "~> 0.4.0"}, config: []}
+    %{dep: {:pythonx, "~> 0.4.2"}, config: []}
   end
 
   def pythonx_requirement(), do: "~> 0.4.0"

mix.exs

@@ -125,7 +125,7 @@ defmodule Livebook.MixProject do
       {:floki, ">= 0.27.0", only: :test},
       {:bypass, "~> 2.1", only: :test},
       # So that we can test Python evaluation in the same node
-      {:pythonx, "~> 0.4.0", only: :test},
+      {:pythonx, "~> 0.4.2", only: :test},
       # ZTA deps
       {:jose, "~> 1.11.5"},
       {:req, "~> 0.5.8"},

test/livebook/live_markdown/export_test.exs

@@ -1171,7 +1171,7 @@ defmodule Livebook.LiveMarkdown.ExportTest do
             Notebook.Cell.new(:code)
             | source: """
               Mix.install([
-                {:pythonx, "~> 0.4.0"}
+                {:pythonx, "~> 0.4.2"}
               ])\
               """
           },
@@ -1193,7 +1193,7 @@ defmodule Livebook.LiveMarkdown.ExportTest do
 
       ```elixir
       Mix.install([
-        {:pythonx, "~> 0.4.0"}
+        {:pythonx, "~> 0.4.2"}
       ])
       ```
 

test/livebook/live_markdown/import_test.exs

@@ -1157,7 +1157,7 @@ defmodule Livebook.LiveMarkdown.ImportTest do
 
       ```elixir
       Mix.install([
-        {:pythonx, "~> 0.4.0"}
+        {:pythonx, "~> 0.4.2"}
       ])
       ```
 
@@ -1180,7 +1180,7 @@ defmodule Livebook.LiveMarkdown.ImportTest do
                      id: "setup",
                      source: """
                      Mix.install([
-                       {:pythonx, "~> 0.4.0"}
+                       {:pythonx, "~> 0.4.2"}
                      ])\
                      """
                    },

test/livebook/notebook/export/elixir_test.exs

@@ -203,7 +203,7 @@ defmodule Livebook.Notebook.Export.ElixirTest do
           Notebook.Cell.new(:code)
           | source: """
             Mix.install([
-              {:pythonx, "~> 0.4.0"}
+              {:pythonx, "~> 0.4.2"}
             ])\
             """
         },
@@ -226,7 +226,7 @@ defmodule Livebook.Notebook.Export.ElixirTest do
     # Title: My Notebook
 
     Mix.install([
-      {:pythonx, "~> 0.4.0"}
+      {:pythonx, "~> 0.4.2"}
     ])
 
     Pythonx.uv_init("""