Update doctrine/instantiator requirement from ^1.4 to ^1.4 || ^2.0

[dependabot[bot]]

Updates the requirements on doctrine/instantiator to permit the latest version.

Release notes

Sourced from doctrine/instantiator's releases.

2.0.0

Release Notes for 2.0.0

Backwards incompatible release (major)

2.0.0

• Total issues resolved: 0
• Total pull requests resolved: 1
• Total contributors: 1

BC break

• 94: Migrate codebase to PHP 8.1 thanks to @​derrabus

Commits

• c622228 Migrate codebase to PHP 8.1 (#94)
• 0a0fa97 Deprecate internal constants (#96)
• b289625 Simplify composer command line (#95)
• 6f1e0c4 Bump dev tools and CI workflows (#93)
• 6e6ce1e Fix tests on PHP 8.2 (#91)
• 10dcfce Fail nicely on enum FQCNs (#90)
• 16d01f9 Bump dev tools and CI workflows (#89)
• 39b9008 Merge pull request #87 from greg0ire/reuse-workflows
• 4161526 Reuse workflows from upstream and setup Psalm
• c3e0f46 Merge pull request #85 from greg0ire/ramsey-composer-install
• Additional commits viewable in compare view

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