Temporarily ignore issues #2131 and #2176 (and any other pip 25.1 issues)

This is in order to see other tests all pass in CI during the PR review.
I suggest dropping this commit before the PR is merged.

Author: AndydeCleyre

pyproject.toml

@@ -39,7 +39,7 @@ dependencies = [
   # direct dependencies
   "build >= 1.0.0",
   "click >= 8",
-  "pip >= 22.2",
+  "pip >= 22.2, < 25.1",
   "pyproject_hooks",
   "tomli; python_version < '3.11'",
   # indirect dependencies

tests/test_cli_compile.py

@@ -1479,6 +1479,7 @@ def test_multiple_input_files_without_output_file(runner):
     assert out.exit_code == 2
 
 
+@pytest.mark.xfail(reason="Temporarily ignore #2131 while fixing CI")
 @pytest.mark.parametrize(
     ("options", "expected"),
     (
@@ -3235,6 +3236,7 @@ def test_resolver_reaches_max_rounds(runner):
     assert out.exit_code != 0, out
 
 
+@pytest.mark.xfail(reason="Temporarily ignore #2131 while fixing CI")
 def test_preserve_via_requirements_constrained_dependencies_when_run_twice(
     pip_conf, runner
 ):