upgrade to klog v2.4.0

[prezha]

we're currently using klog v2.3.0 and there is a known issue with --log_file_max_size minikube/klog option flag not working (being ignored), that was fixed in v2.4.0

Steps to reproduce the issue:

1. minikube start --log_file='mqb.log' --log_file_max_size=3

result: the log file size will eventually grow over the set limit (3mb in this example)

ref: klog issue #171, pr #172

in addition to fixing this bug, v2.4.0 introduced 2 new things:

• one_output flag:

If true, only write logs to their native severity level (vs also writing to each lower severity level

• LogFilter capabilities:

LogFilter is a collection of functions that can filter all logging calls, e.g. for sanitization of arguments and prevent accidental leaking of secrets.

and no other major changes

another interesting reason for upgrading to v2.4.0 is the release comment: Prepare release for Kubernetes v1.20

[prezha]

/assign