deps: update development constraints

pyproject.toml

@@ -52,17 +52,15 @@ importlib-metadata = {version = "^1.6.0", python = "<3.8"}
 dataclasses = {version = "^0.8", python = "~3.6"}
 
 [tool.poetry.dev-dependencies]
-pytest = "^5.4.3"
-pytest-cov = "^2.5"
-pytest-mock = "^1.9"
+pytest = "^6.2"
+pytest-cov = "^2.8"
+pytest-mock = "^3.5"
 pre-commit = { version = "^2.6", python = "^3.6.1" }
 tox = "^3.0"
-pytest-sugar = "^0.9.2"
+pytest-sugar = "^0.9"
 httpretty = "^1.0"
 zipp = { version = "^3.4", python = "<3.8"}
-deepdiff = "^5.0.2"
-# temporary workaround for /~https://github.com/python-poetry/poetry/issues/3404
-urllib3 = "1.25.10"
+deepdiff = "^5.0"
 
 [tool.poetry.scripts]
 poetry = "poetry.console.application:main"

tests/repositories/test_installed_repository.py

@@ -3,7 +3,7 @@
 
 import pytest
 
-from pytest_mock.plugin import MockFixture
+from pytest_mock.plugin import MockerFixture
 
 from poetry.core.packages.package import Package
 from poetry.repositories.installed_repository import InstalledRepository
@@ -59,7 +59,7 @@ def env() -> MockEnv:
 
 
 @pytest.fixture
-def repository(mocker: MockFixture, env: MockEnv) -> InstalledRepository:
+def repository(mocker: MockerFixture, env: MockEnv) -> InstalledRepository:
     mocker.patch(
         "poetry.utils._compat.metadata.Distribution.discover",
         return_value=INSTALLED_RESULTS,