Update analyzer to >=7.4.0 <9.0.0 and bump related packages

[josh-audio]

This PR updates mobx_codegen to use analyzer: '>=7.4.0 < 9.0.0', and also upgrades some related packages. analyzer >= 8.0.0 removes the old Element v1 API, and deprecates the v2 names (e.g. ClassElement2).

This PR also resolves associated deprecations, and removes all deprecation ignore comments except for one, which is unrelated to this change as far as I can tell.

Deprecation changes have been reverted, see discussion below.

---

Pull Request Checklist

• If the changes are being made to code, ensure the version in pubspec.yaml is updated.
• Increment the major/minor/patch/patch-count, depending on the complexity of change
• Add the necessary unit tests to ensure the coverage does not drop
• Update the Changelog to include all changes made in this PR, organized by version
• Run the melos run set_version command from the root directory
• Include the necessary reviewers for the PR
• Update the docs if there are any API changes or additions to functionality

[josh-audio]

As requested in the PR template, pinging some folks for review:

• @amondnet
• @pavanpodila

Thank you!

[Copilot]

Pull Request Overview

This PR updates the mobx_codegen package to use analyzer version 8.1.1 and resolves all associated deprecations by migrating from the deprecated Element v2 API to the current Element API.

• Upgraded analyzer to ^8.1.1 along with related packages (build, source_gen, build_runner, build_resolvers)
• Replaced all deprecated Element2 API usage with the current Element API throughout the codebase
• Updated type checker instantiation from runtime-based to package-scoped references

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
mobx_examples/lib/clock/clock.dart	Changed parameter type from implicit to explicit dynamic
mobx_codegen/pubspec.yaml	Updated package versions and incremented version to 2.7.3
mobx_codegen/lib/version.dart	Updated version constant to match pubspec
mobx_codegen/CHANGELOG.md	Added changelog entry for version 2.7.3
mobx_codegen/test/util_test.dart	Updated import and removed deprecated API usage in test mocks
mobx_codegen/test/store_class_visitor_test.dart	Updated test mocks to use current Element API
mobx_codegen/lib/src/type_names.dart	Migrated from Element2 to Element API throughout type name resolution
mobx_codegen/lib/src/template/*.dart	Updated template classes to use current Element API
mobx_codegen/lib/src/store_class_visitor.dart	Comprehensive migration from Element2 API and updated TypeChecker usage
mobx_codegen/lib/src/mobx_codegen_base.dart	Updated core generator logic to use current Element API

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[josh-audio]

I've updated this PR to widen the supported analyzer range, and I've confirmed this support by setting a few overrides including analyzer: 7.4.0 in pubspec_overrides.yaml and running dart test.

[Copilot]

Pull Request Overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated no new comments.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[amondnet]

@all-contributors
please add @josh-audio for code
please add @amondnet for review, maintenance

[allcontributors]

@amondnet

I've put up a pull request to add @josh-audio! 🎉