Bump updatecli version to v0.64.0

[github-actions]

UPDATECLI.YAML

Bump updatecli version in action.yaml

key "$.inputs.version.default" updated from "v0.63.0" to "v0.64.0", in file "action.yaml"

v0.64.0

Release published on the 2023-10-16 16:59:55 +0000 UTC at the url https://github.com/updatecli/updatecli/releases/tag/v0.64.0

## Changes

- chore: tag pipelineid as required in jsonschema @olblak (#1696)
- update readme for the verify checksum signatures @cpanato (#1686)

## 🚀 Features

- chore: By default autodiscovery actionid should use the pipeline name @olblak (#1693)
- chore: remove time from generated markdown man pages @olblak (#1688)
- chore: clean up Updatecli manifest @olblak (#1687)

## 🐛 Bug Fixes

- fix: fallback to updatecli.yaml or updatecli.d if no manifest specified @olblak (#1695)

## Contributors

@cpanato, @olblak, @updateclibot, @updateclibot[bot] and @v1v

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