Bump charmed-mysql snap revision to latest 8.0/edge (#440)

* Bump charmed-mysql snap revision to test new exporter related changes

* update charmed-mysql snap to latest 8.0/edge revision

* Update data_interfaces charmlib to v0.33

* Update rolling ops charm lib to v0.6

* Update data_interfaces to v0.34 + fix unit tests + misc. cleanup

* Run format

* Secrets changes for data_interfaces v34

* Poetry lock minor upgrade

* Run format

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Co-authored-by: Judit Novak <[email protected]>

Author: shayancanonical