Update schema dependency version

[zhaoqizqwang]

Update schema package to force the version to be 0.7.5 to avoid test failures. Schema is not an actively updated package. Checked with clarify team and it's ok to pin the version to 0.7.5

Issue #, if available:

Description of changes:

*Testing done: No further test needed.

Merge Checklist

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General

• I have read the CONTRIBUTING doc
• I certify that the changes I am introducing will be backward compatible, and I have discussed concerns about this, if any, with the Python SDK team
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Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added unit and/or integration tests as appropriate to ensure backward compatibility of the changes
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• I have used unique_name_from_base to create resource names in integ tests (if appropriate)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.38%. Comparing base (959cb0f) to head (201883f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4540   +/-   ##
=======================================
  Coverage   87.38%   87.38%           
=======================================
  Files         389      389           
  Lines       36776    36776           
=======================================
  Hits        32135    32135           
  Misses       4641     4641           

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[zhaoqizqwang]

/bot run pr

[zhaoqizqwang]

/bot run all

[mufaddal-rohawala]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-pr
• Commit ID: 201883f
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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