Fix different diff in test_cfn_project_main_diff_assets for Python3.14

From python/cpython#119492, "This may change
results in some cases, but no natural ones come to mind, and I don't
care about contrived cases." and also "Correctness of diffs is not
affected. Some similar lines far apart may be reported as deleting
one and adding the other, where before they were displayed on adjacent
output lines with markup showing the intraline differences.".

This change breaks the test for Python3.14

Author: adanaja

tests/tests_e3_aws/troposphere/cfn_project_test.py

@@ -6,6 +6,7 @@
 from typing import TYPE_CHECKING
 from unittest.mock import patch
 from tempfile import TemporaryDirectory
+from textwrap import dedent
 
 from e3.aws import AWSEnv
 from e3.aws.troposphere import CFNProjectMain
@@ -227,10 +228,20 @@ def mocked_color_diff(lines: list[str]) -> list[str]:
         # Diff with the mocked response
         test.execute(args=["show", "--diff", "--assets"], aws_env=aws_env)
 
+    # Only check that the diff part for the code asset of the lambda is in the output.
+    # Checking the whole diff gives different results depending if we are running
+    # Python < 3.14 or Python >= 3.14 https://github.com/python/cpython/pull/119492
     captured = capfd.readouterr()
     print(captured.out)
-    with open(os.path.join(TEST_DIR, "cfn_project_test_diff_assets.out")) as f_out:
-        assert captured.out == f_out.read()
+    assert (
+        dedent(
+            """\
+            Diff for the new version of function mypylambda:
+            + app.py
+            """
+        )
+        in captured.out
+    )
 
 
 def test_cfn_project_main_show_assets(capfd: pytest.CaptureFixture[str]) -> None: