refactor(release): bump FW-CI pin to 43d259e + drop SLACK_WEBHOOK passthrough

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Signed-off-by: oliver könig <okoenig@nvidia.com>

Author: ko3n1g

.github/workflows/release.yml

@@ -84,7 +84,7 @@ jobs:
         || !(needs.pre-flight.outputs.docs_only == 'true'
              || needs.pre-flight.outputs.is_deployment_workflow == 'true')
       )
-    uses: NVIDIA-NeMo/FW-CI-templates/.github/workflows/_release_library.yml@cb5e93b1737dab3e8bfb87d8d9b743cd1d92f6d6
+    uses: NVIDIA-NeMo/FW-CI-templates/.github/workflows/_release_library.yml@43d259e5b5f0a6cb4c14eefa04738a5bdf316fe1
     with:
       release-ref: ${{ inputs.release-ref || github.sha }}
       python-package: nemo
@@ -112,7 +112,6 @@ jobs:
       TWINE_USERNAME: ${{ secrets.TWINE_USERNAME }}
       TWINE_PASSWORD: ${{ secrets.TWINE_PASSWORD }}
       SLACK_WEBHOOK_ADMIN: ${{ secrets.SLACK_WEBHOOK_ADMIN }}
-      SLACK_WEBHOOK: ${{ secrets.SLACK_RELEASE_ENDPOINT }}
       BOT_KEY: ${{ secrets.BOT_KEY }}
       AWS_ASSUME_ROLE_ARN: ${{ secrets.AWS_ASSUME_ROLE_ARN }}
       AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}