bump stpipe

[braingram]

stpipe 0.7.0 is out (containing a fix to the log memory "leak")

This PR bumps the stpipe pin to >=0.7.0 < 0.8.0.

Regression tests running at: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1652/

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
• [ ] added relevant milestone
• [x] added relevant label(s)
• [ ] 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

[codecov[bot]]

Codecov Report

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

Project coverage is 60.38%. Comparing base (aeb7469) to head (b3efddb).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8713 +/- ## ========================================== + Coverage 60.36% 60.38% +0.01% ========================================== Files 372 372 Lines 38338 38337 -1 ========================================== + Hits 23142 23148 +6 + Misses 15196 15189 -7 ```

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