Update codecov config to point to master

[lockshaw]

Description of changes:

Related Issues:

Linked Issues:

• Issue #

Issues closed by this PR:

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Before merging:

• Did you update the flexflow-third-party repo, if modifying any of the Cmake files, the build configs, or the submodules?

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@ Coverage Diff @@ ## master #1570 +/- ## ========================================= Coverage ? 78.50% ========================================= Files ? 867 Lines ? 28904 Branches ? 778 ========================================= Hits ? 22690 Misses ? 6214 Partials ? 0 

Flag	Coverage Δ
unittests	78.50% <ø> (?)

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