remove outdated vendored copies of dependencies: chardet httpsig_cffi idna jwt requests six urllib3

I note that oci-python-sdk does extensive vendoring/embedding of dependencies and this potentially results in missing bug fixes for users of oci-python-sdk.

https://github.com/oracle/oci-python-sdk/
https://github.com/oracle/oci-python-sdk/tree/master/src/oci/_vendor

As an example, PyPI urllib3 is at version 1.26.9 but the oci-python-sdk vendor directory contains 1.26.4, which is missing several important bug fixes:

https://pypi.org/project/urllib3/#changes

If you hadn't vendored that dependency, users of oci-python-sdk would note that urllib3 is pulled in by oci-python-sdk, scanned the version number, noticed there were updates to fix bugs, reviewed the changes and upgraded to the latest version.

I haven't checked the other vendored dependencies for new releases, but I note the last time the vendored dependencies saw version updates was May 2021, which is almost a year ago, which is a very long time in open source, especially for active projects like requests and urllib3.

A similar class of problem is pinning dependencies, but I see that you have thankfully resolved that, but some of the version ranges are still too restrictive.

https://github.com/oracle/oci-python-sdk/issues/343
https://github.com/oracle/oci-python-sdk/issues/419

Start by reviewing the vendored dependency copies under src/oci/_vendor, focusing on chardet, httpsig_cffi, idna, jwt, requests, six, and urllib3. Check the SDK's dependency metadata and packaging behavior; done means the outdated embedded copies are removed without breaking dependency installation or the SDK.