chore: stop forwarding the deprecated GITLEAKS_LICENSE secret

Secret scanning runs on betterleaks, which is OSS and needs no license. The
shared gitleaks reusable declares GITLEAKS_LICENSE only for backwards
compatibility and never reads it, and the org-level secret has been deleted, so
this workflow was handing an empty value to an input that ignores it.

Only the mapping line is removed; the enclosing `secrets:` key goes with it
only when nothing else was left under it. Other secrets in the same block are
untouched.

Signed-off-by: Sebastian Mendel <github@sebastianmendel.de>

Author: CybotTM

.github/workflows/ci.yml

@@ -36,5 +36,3 @@ jobs:
       enable-gitleaks: true
       enable-codeql: false
       enable-smoke-test: false
-    secrets:
-      GITLEAKS_LICENSE: ${{ secrets.GITLEAKS_LICENSE }}