Update Helm release kibana to v6.8.22

[renovate]

This PR contains the following updates:

Package	Update	Change
kibana	patch	6.8.18 → 6.8.22

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Release Notes

elastic/helm-charts (kibana)

v6.8.22

Compare Source

• 6.8.22 as default version.

PR	Author	Title
#​1508	@​jmlrt	[elasticsearch] remove usage of ELASTIC_USERNAME (#​1506)
#​1498	@​elasticmachine	Bump version to 6.8.22-SNAPSHOT

v6.8.21

Compare Source

• 6.8.21 as default version.

PR	Author	Title
#​1410	@​jmlrt	[meta] add support for K8S 1.21 and remove 1.18
#​1300	@​jonkerj	[elasticsearch]: optionally disable SA token automount
#​1382	@​piglovesyou	Fix typo
#​1386	@​jmlrt	[meta] fail make test on error
#​1319	@​cclausss	Fix typos discovered by codespell
#​1105	@​moritazi	[elasticsearch] Add namespace to helm test command in NOTES.txt
#​1362	@​jmlrt	[meta] remove contributing file from 6.8 branch
#​1321	@​elasticmachine	Bump version to 6.8.19-SNAPSHOT
#​1294	@​jmlrt	[meta] add tests for k8s 1.20
#​1232	@​jmlrt	[meta] add helm 3.6.2 support
#​1116	@​nflaig	[elasticsearch] add value to disable tests
#​1115	@​nflaig	[elasticsearch] add value to disable service
#​1337	@​jmlrt	[meta] remove support matrix + nit doc changes

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