Bump Image dependency to v4

[fotiDim]

This PR bumps the Image dependency to v4.

Fixes https://github.com/Baseflow/screenrecorder/issues/39

It would be nice to have a release after this is merged.

Pre-launch Checklist

• [x] 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.
• [x] I ran dart format . and committed any changes.
• [x] I ran flutter analyze and fixed any errors.

[martijn00]

@TimHoogstrate Can you have a look?