chore(deps): update haproxy docker tag to v2

[balena-ci]

This PR contains the following updates:

Package	Type	Update	Change
haproxy	final	major	1.9-alpine -> 2.6-alpine

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[ghost]

An error occurred whilst building your landr site preview:

{
  "name": "Error",
  "message": "Command failed with code undefined: /usr/src/app/node_modules/gatsby/cli.js build",
  "stack": "Error: Command failed with code undefined: /usr/src/app/node_modules/gatsby/cli.js build\n    at Object.exports.run (/usr/src/app/lib/build-runner.js:257:11)\n    at async build (/usr/src/app/bot/index.js:132:19)\n    at async /usr/src/app/bot/index.js:210:25\n    at async Promise.all (index 0)\n    at async middleware (/usr/src/app/node_modules/@octokit/webhooks/dist-node/index.js:355:5)"
}

[klutchell]

Closing stale automated PR. Reopen if this was done in error