fix bundle count for operators

[vedhavyas]

Fix to increment bundle count for operators.

Previously

OperatorBundleCountInEpoch::<T>::mutate(operator_id, |c| c.saturating_add(1));

is not actually incrementing the count since the value c is not mutated but instead we returned the incremented out of the mutate and mutate never actually updates the state.

I have added a test to simulate this behavior.

Also bumped spec_version for chronos runtime upgrade

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[jfrank-summit]

LGTM