Update doctrine/persistence requirement from ^1.3 to ^2.0

[dependabot-preview[bot]]

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

Release notes

Sourced from doctrine/persistence's releases.

2.0.0

Release 2.0.0

2.0.0

• Total issues resolved: 0

• Total pull requests resolved: 9

• Total contributors: 5

• 106: Drop backwards-compatibility layer thanks to @greg0ire

• 74: Merge 1.3.x into master thanks to @alcaeus

Improvement

• 75: Remove return types from all interfaces thanks to @alcaeus
• 61: Add more specific doc block type hints for arrays. thanks to @jwage
• 40: CI: Test against PHP 7.4snapshot instead of nightly (8.0) thanks to @Majkl578

BC Break

• 51: Remove PersistentObject magic object. thanks to @jwage

BC Break,Improvement

• 50: Add types to all interfaces. thanks to @jwage
• 35: Open 2.x thanks to @Majkl578

Enhancement

• 43: Updated doctrine/coding-standard to 6.0 thanks to @patrickjahns

Commits

• 1dee036 Merge remote-tracking branch 'origin/1.4.x' into 2.0.x
• 2b28bb9 Merge pull request #104 from weph/psalm-generics
• 53450e5 Adds generics annotations
• 2918b69 Merge branch '1.4.x' into would-be-2.x
• 7c70c96 Merge remote-tracking branch 'origin/1.3.x' into 1.4.x
• 16fbd29 Merge pull request #105 from greg0ire/psalm-sa
• 2372213 Require and configure Psalm
• 16c639c Reflect the reality in the interface
• 4c6914b Merge pull request #107 from greg0ire/refer-to-new-namespace-in-docs
• 2a2b3f9 Refer to the new namespace in docs
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Looks like doctrine/persistence is up-to-date now, so this is no longer needed.