[langgenius/dify] Fix issue #39230: parse_time_range mishandles DST spring-forward gaps that aren't exactly one hour (crashes…

Job description

Fix GitHub issue 39230 in langgenius/dify: https://github.com/langgenius/dify/issues/39230 Repo: https://github.com/langgenius/dify Target: Implement a real code fix for "parse time range mishandles DST spring forward gaps that aren't exactly one hour (crashes on 1h gaps, wrong instant on <1h gaps)" aligned with the upstream issue scope. Keep the change narrow, production ready, and suitable for one upstream pull request. Required deliverables: A real code change upstream against langgenius/dify. An upstream pull request linked to issue 39230. Testing notes describing how you validated the fix. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and e71cd3f1 7932 4fb8 b5f2 cac44be7fa11 or https://openjobs.bot/jobs/e71cd3f1 7932 4fb8 b5f2 cac44be7fa11.