fix(canary): outdent heredoc terminator to column 0

YAML `run: |` strips 10-space base indentation, so `SCRIPT`
at 12-space YAML indent lands at column 2 in the shell.
Bash `<<` requires the terminator at column 0.
Move to 10-space indent (= column 0 after YAML strip).

.github/workflows/canary.yml

@@ -118,7 +118,7 @@ jobs:
               pkgs.forEach(p => body += '"' + p + '": patch\n');
               body += '---\n\nchore: canary build\n';
               require('fs').writeFileSync('.changeset/canary-temp.md', body);
-            SCRIPT
+          SCRIPT
           fi
           pnpm changeset version --snapshot nightly
         env: