[chart/redis-ha] ha-proxy: opt out of service account mounting

[a-hat]

What this PR does / why we need it:

Hello, for security hardening we would like to set automountServiceAccountToken: false also on the haproxy (on the redis statefulset this is already implemented).

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] DCO signed
• [x] Chart Version bumped
• [x] Variables are documented in the README.md
• [x] Title of the PR starts with chart name (e.g. [stable/mychartname])

[DandyDeveloper]

@a-hat There's some linting issues found post update, can you correct and push?

[a-hat]

@a-hat There's some linting issues found post update, can you correct and push?

Yes, updated and pushed!