Update pytest requirement from <7 to <8 (#151)

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@1.0.0b3...7.1.2)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

setup.py

@@ -37,7 +37,7 @@
     )
     .read()
     .splitlines(),
-    tests_require=["pytest<7"],
+    tests_require=["pytest<8"],
     test_suite="tests",
     scripts=[
         "cwl_utils/docker_extract.py",