README: fix "validate spec" status badge (#657)

the workflow got renamed in commit 2a39edd (#646), thus the link is no
longer valid. this was not caught by the "check links" test as the link
was still valid until the PR got merged. this currently blocks all other
PRs.

Signed-off-by: Ralph Ursprung <[email protected]>

Author: rursprung

README.md

@@ -6,7 +6,7 @@
 [![Test Tools (Unit)](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/test-tools-unit.yml/badge.svg)](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/test-tools-unit.yml)
 [![Test Tools (Integration)](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/test-tools-integ.yml/badge.svg)](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/test-tools-integ.yml)
 [![Test Spec](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/test-spec.yml/badge.svg)](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/test-spec.yml)
-[![Validate Spec](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/validate-spec.yml/badge.svg)](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/validate-spec.yml)
+[![Validate Spec](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/validate-spec-lint.yml/badge.svg)](https://github.com/opensearch-project/opensearch-api-specification/actions/workflows/validate-spec-lint.yml)
 
 - [OpenSearch API Specification](#opensearch-api-specification)
 - [Welcome!](#welcome)