fix: bump action image

Bump action image to the latest released version.

Signed-off-by: Yann Soubeyrand <8511577+yann-soubeyrand@users.noreply.github.com>
Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

Author: yann-soubeyrand

action.yml

@@ -9,6 +9,6 @@ inputs:
     required: true
 runs:
   using: "docker"
-  image: "docker://ghcr.io/siderolabs/conform:v0.1.0-alpha.27"
+  image: "docker://ghcr.io/siderolabs/conform:v0.1.0-alpha.31"
   args:
     - 'enforce'