ci: fix renovate config for WolfSSL/WolfSSH tagging scheme

WolfSSL/WolfSSH use a different versioning scheme;
stable builds end with `-stable`. Renovate requires
some extra configuration to extract the version
from these types of tags.

Closes #13644

.github/scripts/VERSIONS

@@ -2,8 +2,8 @@
 #
 # SPDX-License-Identifier: curl
 
-# renovate: datasource=github-tags depName=wolfSSL/wolfssl versioning=semver registryUrl=https://github.com
+# renovate: datasource=github-tags depName=wolfSSL/wolfssl versioning=semver extractVersion=^v?(?<version>.+)-stable$ registryUrl=https://github.com
 WOLFSSL_VER=5.6.0
 
-# renovate: datasource=github-tags depName=wolfSSL/wolfssh versioning=semver registryUrl=https://github.com
+# renovate: datasource=github-tags depName=wolfSSL/wolfssh versioning=semver extractVersion=^v?(?<version>.+)-stable$ registryUrl=https://github.com
 WOLFSSH_VER=1.4.12