Pinning GitHub actions (#40)

Author: elgordomac

.github/workflows/sdk_generation.yaml

@@ -18,7 +18,7 @@ permissions:
     - cron: 0 0 * * *
 jobs:
   generate:
-    uses: speakeasy-api/sdk-generation-action/.github/workflows/workflow-executor.yaml@v15
+    uses: speakeasy-api/sdk-generation-action/.github/workflows/workflow-executor.yaml@3fdab59e74dda7831d7401f7aa1bb55d706913d7 # v15
     with:
       force: ${{ github.event.inputs.force }}
       mode: pr

.github/workflows/sdk_publish.yaml

@@ -13,7 +13,7 @@ permissions:
   workflow_dispatch: {}
 jobs:
   publish:
-    uses: speakeasy-api/sdk-generation-action/.github/workflows/sdk-publish.yaml@v15
+    uses: speakeasy-api/sdk-generation-action/.github/workflows/sdk-publish.yaml@3fdab59e74dda7831d7401f7aa1bb55d706913d7 # v15
     with:
       target: stack-one
     secrets: