chore(update-yara-x): add actions: write to trust policy as well (#1463)

Signed-off-by: egibs <20933572+egibs@users.noreply.github.com>

Author: egibs

.github/chainguard/update-yara-x.sts.yaml

@@ -4,6 +4,7 @@ claim_pattern:
   workflow_ref: chainguard-dev/malcontent/.github/workflows/update-yara-x.yaml@refs/heads/main
 
 permissions:
+  actions: write
   contents: write
   pull_requests: write
   workflows: write