manifest: Remove tinycbor

tinycbor was removed from the upstream zephyr manifest a long
time ago, therefore remove it from the ncs manifest import.

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

west.yml

@@ -96,7 +96,6 @@ manifest:
           - picolibc
           - psa-arch-tests
           - segger
-          - tinycbor
           - tinycrypt
           - tf-m-tests
           - uoscore-uedhoc