vale: add GHSA to acronyms

GHSA is for GitHub Security Advisories;
https://docs.github.com/en/code-security/security-advisories/working-with-global-security-advisories-from-the-github-advisory-database/about-the-github-advisory-database

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.github/vale/Docker/Acronyms.yml

@@ -27,6 +27,7 @@ exceptions:
   - GCC
   - GDB
   - GET
+  - GHSA
   - GPU
   - GTK
   - GUI