Add yaml to tiny_config deps

Author: mooreryan

.github/workflows/build_and_test.yml

@@ -106,7 +106,7 @@ jobs:
         run: |
           git clone https://github.com/mooreryan/tiny_config.git
           cd tiny_config
-          opam install base otoml
+          opam install base otoml yaml
           opam pin add tiny_config .
           opam pin add tiny_toml .
           opam install tiny_config