ci: pin azure/powershell to release commit

Author: Mehdi-Bl

.github/workflows/reusable-claude-review.yml

@@ -113,7 +113,7 @@ jobs:
 
       - name: Fetch Claude OAuth token from Azure Key Vault
         id: keyvault
-        uses: azure/powershell@6101bc5f8a23168669e44f7e68db621ec5ecbc6e # v2
+        uses: azure/powershell@53dd145408794f7e80f97cfcca04155c85234709 # v2.0.0
         env:
           AZURE_KEY_VAULT_NAME: ${{ inputs.azure_key_vault_name }}
           CLAUDE_SECRET_NAME: ${{ inputs.claude_secret_name }}

.github/workflows/reusable-opencode-review.yml

@@ -184,7 +184,7 @@ jobs:
 
       - name: Fetch OpenCode model key from Azure Key Vault
         id: keyvault
-        uses: azure/powershell@6101bc5f8a23168669e44f7e68db621ec5ecbc6e # v2
+        uses: azure/powershell@53dd145408794f7e80f97cfcca04155c85234709 # v2.0.0
         env:
           AZURE_KEY_VAULT_NAME: ${{ inputs.azure_key_vault_name }}
           ZHIPU_SECRET_NAME: ${{ inputs.zhipu_secret_name }}