[proxysg] update release version

[jrmolin]

Proposed commit message

[proxysg] update changelog and manifest to create new release

• update changelog, manifest
• include the mappings for client.bytes and server.bytes

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

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Pinging @elastic/integration-experience (Team:Integration-Experience)

[elastic-vault-github-plugin-prod]

Package proxysg - 0.6.2 containing this change is available at https://epr.elastic.co/package/proxysg/0.6.2/