Backport of "testsrcbin: Remove spurious caps unref" into 1.22
Backport of !4668 (merged) "testsrcbin: Remove spurious caps unref".
Commits:
- 6dff93ac testsrcbin: Remove spurious caps unref
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Backport of !4668 (merged) "testsrcbin: Remove spurious caps unref".
Commits: