GitHub Actions: fix syntax error of building-with-pegof.yml

Author: leleliu008

.github/workflows/building-with-pegof.yml

@@ -44,7 +44,8 @@ jobs:
 
       - run: ./ctags --list-features | grep pegof
 
-      - run: echo "Targets: $(./ctags --list-languages=_packcc |  tr '\n' ',')"
+      - run: |
+          echo "Targets: $(./ctags --list-languages=_packcc |  tr '\n' ',')"
       - run: make units LANGUAGES="$(./ctags --list-languages=_packcc |  tr '\n' ',')"
       - run: make dist
         # See EXTRA_DIST in Makefile.am.