Fix extras listing twice with direct file URL

Fix #5536.

Bump vendored requirementslib to 2.2.3 which includes the actual fix.
Also, add a test case for this in pipenv.

pipenv/vendor/vendor.txt

@@ -12,7 +12,7 @@ ptyprocess==0.7.0
 pyparsing==3.0.9
 python-dotenv==0.19.0
 pythonfinder==1.3.1
-requirementslib==2.2.1
+requirementslib==2.2.3
 ruamel.yaml==0.17.21
 shellingham==1.5.0
 toml==0.10.2

tests/integration/test_install_misc.py

@@ -0,0 +1,24 @@
+import os
+import pytest 
+
+@pytest.mark.urls
+@pytest.mark.extras
+@pytest.mark.install
+def test_install_uri_with_extras(pipenv_instance_private_pypi):
+    file_uri = "http://localhost:8080/packages/plette/plette-0.2.2-py2.py3-none-any.whl"
+    index = os.environ['PIPENV_TEST_INDEX']
+    with pipenv_instance_private_pypi() as p:
+        with open(p.pipfile_path, 'w') as f:
+            contents = """
+[[source]]
+url = "{index}"
+verify_ssl = false
+name = "testindex"
+
+[packages]
+plette = {{file = "{file_uri}", extras = ["validation"]}}
+""".format(file_uri=file_uri, index=index)
+            f.write(contents)
+        c = p.pipenv("install")
+        assert c.returncode == 0
+        assert "plette" in p.lockfile["default"]