Update Helm release eck-operator to v2.16.0

[renovate]

This PR contains the following updates:

Package	Update	Change
eck-operator	minor	2.15.0 -> 2.16.0

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Release Notes

elastic/cloud-on-k8s (eck-operator)

v2.16.0

Compare Source

Elastic Cloud on Kubernetes 2.16.0

• Release highlights
• Quickstart guide

New features

• Support remote clusters using API keys #​8089 (issues: #​7818, #​8167)

Enhancements

• Make Helm chart consistent in respect to handling of 'spec'. (eck-fleet-server) #​8285
• Make Helm chart consistent in respect to handling of 'spec'. (eck-beats) #​8248
• Make Helm chart consistent in respect to handling of 'spec'. (eck-agent) #​8246
• Make Helm chart consistent in respect to handling of 'spec'. (eck-kibana) #​8192
• Set default hardened security context for Kibana. #​8086 (issue: #​7787)
• Add a setting in the Helm chart to deploy FIPS compliant ECK image. #​8272 (issue: #​8204)
• Remove kube-rbac-proxy and adjust default approach to securing the metrics endpoint. #​8302 (issue: #​8279)

Bug fixes

• Allow Beats stack monitoring without elasticseachRef. #​8273 (issue: #​8194)
• Add recommened roles for Elastic Agent on Kubernetes. #​8188 (issue: #​8168)
• Set 'basePath' in Metricbeat when using stack monitoring #​8311 (issue: #​8310)

Documentation improvements

• Optimization of the quickstart sections. #​8128
• Optimization of overview and support help. #​8130
• Remove node.remote_cluster_client from examples. #​8274
• Update the guidance for the stack config policy/role mapping issue. #​8247
• Update stack monitoring documentation. #​8198
• Document remote clusters using API keys. #​8181 (issue: #​8167)
• Add Kibana to the Enterprise search sample. #​8166 (issue: #​5090)
• Add explanation line for es ingress 9300 port. #​8164 (issue: #​7833)
• Clarify high availability recommendations in Elasticsearch orchestration docs. #​8151
• Add note on how to access generated Kibana encryption keys. #​8150 (issue: #​8129)
• Move Troubleshooting section to top level of table of contents. #​8145 (issue: #​8131)
• Add is_managed: true to Agent policies. #​8125 (issue: #​7290)
• Adds a secure settings link to K8s docs and note the need to be base64 encoded. #​8113

Misc

• Enterprise Search transition to Elasticsearch #​8323 (issue: #​8308)
• fix(deps): update module golang.org/x/crypto to v0.29.0 #​8240
• chore(deps): update registry.access.redhat.com/ubi9/ubi-minimal docker tag to v9.5-1731604394 #​8237
• chore(deps): update go to v1.23.3 #​8190
• fix(deps): update module github.com/prometheus/common to v0.60.1 #​8178
• fix(deps): update k8s versions #​8163
• chore(deps): update wolfi (versioned) #​8162
• fix(deps): update module github.com/prometheus/client_golang to v1.20.5 #​8133
• fix(deps): Bump golang.org/x/crypto from 0.29.0 to 0.31.0 #​8341

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