Upgrade spdlog submodule to v.1.5.0
Description
The spdlog package used as submodule in DORiE has received substantial upgrades. As of now, version 1.5.0 is available and we are currently using v1.1.0 in DORiE. Using the recent GCC 9.3, this old version now causes several compiler warnings.
Proposal
Upgrade the spdlog submodule to v1.5.0. The API was not changed, so there is no need for any updates on our side.
How to test the implementation?
Everything still works as before.
Related issues
None.
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