Update about-releases.mdx

Add Note explaining why there is a daily release of purlvalidator-go

Signed-off-by: Michael Herzog <mjherzog@aboutcode.org>

Author: mjherzog

website/docs/about/about-releases.mdx

@@ -9,4 +9,7 @@ import ReleasesTable from '@site/src/components/ReleasesTable';
 This table lists the latest release for each major AboutCode project with the
 table rows sorted by release date in descending order.
 
+Note that there is a daily "patch" release of the [purl-validator-go](https://github.com/aboutcode-org/purlvalidator-go)
+project with new PURL data embedded in this library.
+
 <ReleasesTable />