increase stdatamodels and stpipe versions

[braingram]

stdatamodels 2.0.0 is available: https://pypi.org/project/stdatamodels/2.0.0/ stpipe 0.6.0 is available: https://pypi.org/project/stpipe/0.6.0/

This PR updates the requirements to allow for and require the new versions.

Checklist for PR authors (skip items if you don't have permissions or they are not applicable)

• [x] added entry in CHANGES.rst within the relevant release section
• [ ] updated or added relevant tests
• [ ] updated relevant documentation
• [x] added relevant milestone
• [x] added relevant label(s)
• [x] ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR
• [ ] All comments are resolved
• [ ] Make sure the JIRA ticket is resolved properly

[braingram]

Regtests running at: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1557/

~I'll restart the check-dependencies job after the CI finishes (it didn't see stpipe 0.6.0 yet).~ EDIT: restarted the check-dependencies job and it picked up the newly released stpipe 0.6.0 and passed.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.54%. Comparing base (d668926) to head (b1baedb). Report is 465 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8592 +/- ## ========================================== + Coverage 59.51% 59.54% +0.03% ========================================== Files 391 391 Lines 39254 39288 +34 ========================================== + Hits 23362 23396 +34 Misses 15892 15892 ```

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[hbushouse]

Regtest run showed only 3 of the failures that often occur randomly. So it looks OK.