dnt

This PR updates the function in to correctly extract version numbers from JSR URLs, as mentioned in the issue #481 , in addition to the existing Deno Land URLs. The regex has been modified to match both /dnt@version/ (legacy) and /@deno/dnt/version/ (JSR) patterns. Previously, when dnt was imported from JSR, would always return "dev" because the URL format wasn't recognized. Now it properly extracts the version (e.g., "1.2.3") from JSR URLs like https://jsr.io/@deno/dnt/1.2.3/mod.ts. Testing: All existing tests pass New test validates JSR URL version extraction Full test suite runs successfully (except for unrelated yarn dependency test as i havent downloaded yarn, still if issues came up, i will check that too.)