Failed to load rust-bitcoin/rust-bitcoin-maintainer-tools/master/.github/actions/update-stable/action.yml

GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. rust-bitcoin/rust-bitcoin-maintainer-tools/master/.github/actions/update-stable/action.yml (Line: 32, Col: 18): A template expression is not allowed in this context at GitHub.DistributedTask.ObjectTemplating.TemplateValidationErrors.Check() at GitHub.Runner.Worker.ActionManifestManagerLegacy.ConvertRuns(IExecutionContext executionContext, TemplateContext templateContext, TemplateToken inputsToken, String fileRelativePath, MappingToken outputs) at GitHub.Runner.Worker.ActionManifestManagerLegacy.Load(IExecutionContext executionContext, String manifestFile)