Pin textual >=3.4.0

Textual was pinned to `3.4.0` in #524 but since many versions have been released. Let's see how things go when updating the pin to be `>3.4.0`.

Author: JoeZiminski

pyproject.toml

@@ -19,7 +19,7 @@ dependencies = [
     "fancylog>=0.4.2",
     "simplejson",
     "pyperclip",
-    "textual==3.4.0",
+    "textual>=3.4.0",
     "show-in-file-manager",
     "gitpython",
     "typeguard",