Bump org.snakeyaml:snakeyaml-engine from 2.10 to 3.0.1 (#1538)

Bumps [org.snakeyaml:snakeyaml-engine](https://bitbucket.org/snakeyaml/snakeyaml-engine) from 2.10 to 3.0.1.
- [Commits](https://bitbucket.org/snakeyaml/snakeyaml-engine/branches/compare/snakeyaml-engine-3.0.1..snakeyaml-engine-2.10)

---
updated-dependencies:
- dependency-name: org.snakeyaml:snakeyaml-engine
  dependency-version: 3.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dan Chao <dan.chao@apple.com>

pkl-core/src/main/java/org/pkl/core/stdlib/yaml/ParserNodes.java

@@ -134,6 +134,7 @@ public final class ParserNodes {
     var settings =
         LoadSettings.builder()
             .setMaxAliasesForCollections(getMaxCollectionAliases(self))
+            .setAllowNonScalarKeys(true)
             .setSchema(
                 new Schema() {
                   @Override