chore(ci): upgrade actions/github-script

Author: stainless-app[bot]

.github/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Get GitHub OIDC Token
         if: github.repository == 'stainless-sdks/togetherai-python'
         id: github-oidc
-        uses: actions/github-script@v6
+        uses: actions/github-script@v8
         with:
           script: core.setOutput('github_token', await core.getIDToken());