feat: 🎸 upgrade to Angular 18

[chimurai]

BREAKING CHANGE: 🧨 The library now requires minimum version of Angular 18.0.0

• npx ng update @angular/core@18 @angular/cli@18 @angular/cdk@18 @angular-eslint/schematics@18 --force
• yarn upgrade jest-preset-angular@14.1.0
• yarn upgrade @angular-builders/jest@18
• yarn upgrade browserslist (fix BrowserslistError)
• bump @angular peer dependencies to v18

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngneat/spectator/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[x] Yes
[ ] No

Other information

[stackblitz]

Run & review this pull request in StackBlitz Codeflow.