Unique lamba use pbr

Lambda function for unique ptr abstraction needs pbr semantics
to perform make_unique properly.
#TODO ensure proper ref count on return objects
3 jobs for !180 with bug/fixup-unique-constructor in 17 minutes and 26 seconds
merge request
Name Stage Failure
failed
python3 Build
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Errors while running CTest
Output from these tests are in: /builds/autopybind11/autopybind11/build/Testing/Temporary/LastTest.log
Use "--rerun-failed --output-on-failure" to re-run the failed cases verbosely.
Cleaning up file based variables
ERROR: Job failed: exit code 1