Cherry-pick #22919 to 7.x: Update k8s client and release k8s lock gracefully

[ChrsMark]

Cherry-pick of PR #22919 to 7.x branch. Original message:

What does this PR do?

Updates k8s go client to utilise a fix so as to gracefully release leader lock.

Why is it important?

To release the leader lease gracefully and make it instantly available for other candidates.

Related issues

• Closes [Kubernetes] Release leader lock on shutdown for faster failover #21952
• Relates Kubernetes leaderelection improvements #21896

How to test this PR locally

1. Deploy a k8s cluster using kind: kind create cluster --config kind-mutly.yaml

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
- role: worker
- role: worker

2. Deploy metricbeat with the latest change included using 7.11.0-SNAPSHOT

metricbeat-kubernetes-leader.7.11.yaml.txt

3. Follow the logs of the 2 daemonset pods and kill the one holding the lease. Verify that no errors occur and that the lease was gained by the other Pod.

4. Verify that basic autodiscovery works along with metadata:
   nats.yaml.txt

[elasticmachine]

Pinging @elastic/integrations-platforms (Team:Platforms)

[elasticmachine]

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Build stats

• Build Cause: Pull request #23013 updated

• Start Time: 2020-12-09T07:03:45.429+0000

• Duration: 90 min 32 sec

Test stats 🧪

Test	Results
Failed	0
Passed	16876
Skipped	1398
Total	18274

Steps errors

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Terraform Apply on x-pack/metricbeat/module/aws

• Took 0 min 16 sec . View more details on here

Terraform Apply on x-pack/metricbeat/module/aws

• Took 0 min 15 sec . View more details on here

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Tests succeeded.

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Test stats 🧪

Test	Results
Failed	0
Passed	16876
Skipped	1398
Total	18274