Try to support prompt_toolkit >3.0.37

Fixes: https://github.com/tmbo/questionary/issues/344

--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ license = "MIT"
 
 [tool.poetry.dependencies]
 python = ">=3.8"
-prompt_toolkit = ">=2.0,<=3.0.36"  # once https://github.com/prompt-toolkit/python-prompt-toolkit/issues/1726 is fixed, this can be changed to ">=2.0,<4.0"
+prompt_toolkit = ">=2.0,<4.0"
 
 [tool.poetry.group.docs]
 optional = true
diff --git a/tests/prompts/test_common.py b/tests/prompts/test_common.py
index d6ce51e..b6bbe1b 100644
--- a/tests/prompts/test_common.py
+++ b/tests/prompts/test_common.py
@@ -1,8 +1,10 @@
+import asyncio
 from unittest.mock import Mock
 from unittest.mock import call
 
 import pytest
 from prompt_toolkit.document import Document
+from prompt_toolkit.input.defaults import create_pipe_input
 from prompt_toolkit.output import DummyOutput
 from prompt_toolkit.styles import Attrs
 from prompt_toolkit.validation import ValidationError
@@ -13,7 +15,6 @@ from questionary.prompts import common
 from questionary.prompts.common import InquirerControl
 from questionary.prompts.common import build_validator
 from questionary.prompts.common import print_formatted_text
-from tests.utils import execute_with_input_pipe
 from tests.utils import prompt_toolkit_version
 
 
@@ -72,7 +73,7 @@ def test_blank_line_fix():
 
     ic = InquirerControl(["a", "b", "c"])
 
-    def run(inp):
+    async def run(inp):
         inp.send_text("")
         layout = common.create_inquirer_layout(
             ic, get_prompt_tokens, input=inp, output=DummyOutput()
@@ -86,7 +87,15 @@ def test_blank_line_fix():
             == 1000000000000000000000000000001
         )
 
-    execute_with_input_pipe(run)
+    if prompt_toolkit_version < (3, 0, 29):
+        inp = create_pipe_input()
+        try:
+            return asyncio.run(run(inp))
+        finally:
+            inp.close()
+    else:
+        with create_pipe_input() as inp:
+            asyncio.run(run(inp))
 
 
 def test_prompt_highlight_coexist():