fix(pip): guess what: type hint for readPipReport (again.again)

for mypy

src/rez_pip/pip.py

@@ -146,5 +146,5 @@ def _readPipReport(reportPath: str) -> typing.Dict[typing.Any, typing.Any]:
     Retrieve the json report generated by pip as json dict object.
     """
     with open(reportPath, "r", encoding="utf-8") as reportFile:
-        reportContent = json.load(reportFile)
+        reportContent: typing.Dict[typing.Any, typing.Any] = json.load(reportFile)
     return reportContent