fix(ci): use correct release-please actions URL

[sebmellen]

What this PR does / why we need it:
This PR updates the operator-release-please action to use the new URL so the action will run without issue.

Which issue(s) this PR fixes:
Fixes #12942

Special notes for your reviewer:
See googleapis/release-please-action#980 for more context.

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
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• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[CLAassistant]

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