chore(deps): update helm chart flagger to v1.18.0

[renovate-self-hosted]

This PR contains the following updates:

Package	Update	Change
flagger (source)	minor	1.17.0 -> 1.18.0

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Release Notes

fluxcd/flagger

v1.18.0

Compare Source

Release date: 2022-02-14

This release comes with a new API field called canaryReadyThreshold
that allows setting the percentage of pods that need to be available
to consider the canary deployment as ready.

Starting with version, the canary deployment labels, annotations and
replicas fields are copied to the primary deployment at promotion time.

Features

• Add field spec.analysis.canaryReadyThreshold for configuring canary threshold
  #​1102

Improvements

• Update metadata during subsequent promote
  #​1092
• Set primary deployment replicas when autoscaler isn't used
  #​1106
• Update matchLabels for TopologySpreadContstraints in Deployments
  #​1041

Fixes

• Send warning and error alerts correctly
  #​1105
• Fix for when Prometheus returns NaN
  #​1095
• docs: Fix typo ExternalDNS
  #​1103

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