Artifact attestations: update policy-controller version number (#55289)

Signed-off-by: Cody Soyland <codysoyland@github.com>
Co-authored-by: Sarita Iyer <66540150+saritai@users.noreply.github.com>

Author: codysoyland

Diff for: content/actions/security-for-github-actions/using-artifact-attestations/enforcing-artifact-attestations-with-a-kubernetes-admission-controller.md

@@ -55,7 +55,7 @@ First, install the Helm chart that deploys the Sigstore Policy Controller:
 helm upgrade policy-controller --install --atomic \
   --create-namespace --namespace artifact-attestations \
   oci://ghcr.io/github/artifact-attestations-helm-charts/policy-controller \
-  --version v0.12.0-github10
+  --version v0.12.0-github12
 ```
 
 This installs the Policy Controller into the `artifact-attestations` namespace. At this point, no policies have been configured, and it will not enforce any attestations.
@@ -139,7 +139,7 @@ To see the full set of options you may configure with the Helm chart, you can ru
 For policy controller options:
 
 ```bash copy
-helm show values oci://ghcr.io/github/artifact-attestations-helm-charts/policy-controller --version v0.12.0-github10
+helm show values oci://ghcr.io/github/artifact-attestations-helm-charts/policy-controller --version v0.12.0-github12
 ```
 
 For trust policy options: