Fixed issue in geolocator_web [A value of type num cannot be assign t…

[HKTareen]

On the web, package was giving error : num cannot be assign to double so i just cast to double in the Constructor

List at least one fixed issue.

1. Casting from num to double in the web

Pre-launch Checklist

• [ ] I made sure the project builds.
• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [x] I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is does not need version changes.
• [x] I updated CHANGELOG.md to add a description of the change.
• [ ] I updated/added relevant documentation (doc comments with ///).
• [x] I rebased onto main.
• [ ] I added new tests to check the change I am making, or this PR does not need tests.
• [x] I made sure all existing and new tests are passing.
• [ ] I ran dart format . and committed any changes.
• [ ] I ran flutter analyze and fixed any errors.