[NO GBP] Fixes me actually breaking Run DreamChecker (tgstation#78291)

> `bash`/`sh`:
By default, fail-fast behavior is enforced using `set -e` for both `sh`
and `bash`. When `shell: bash` is specified, `-o pipefail` is also
applied to enforce early exit from pipelines that generate a non-zero
exit status.

it helps when I actually read the docs

.github/workflows/ci_suite.yml

@@ -68,6 +68,7 @@ jobs:
         run: tools/bootstrap/python -m define_sanity.check
       - name: Run DreamChecker
         if: steps.linter-setup.conclusion == 'success' && !cancelled()
+        shell: bash
         run: ~/dreamchecker 2>&1 | bash tools/ci/annotate_dm.sh
       - name: Run Map Checks
         if: steps.linter-setup.conclusion == 'success' && !cancelled()