Update protobuf requirement from <5.0.0dev,>=3.20.0 to >=3.20.0,<6.0.0

[dependabot[bot]]

Updates the requirements on protobuf to permit the latest version.

Commits

• d00db12 Updating version.json and repo version numbers to: 26.0-rc1
• aa3b976 Update minimum macOS to 10.15.
• 17729cc Call ExtensionRegistry.add for JavaFeaturesProto.java directly.
• 570c386 Auto-generate files after cl/601195914
• ca5ca62 Fixed a bug when deep copying a map field with a closed enum value.
• 21eb4e9 Internal changes.
• e6aa580 Do not store binary data inside php files (#13911)
• 6f86726 Rollback version validations in Protobuf Java Lite.
• 4517308 Also apply r# prefix to crates whose names are reserved keywords
• af339fa Fixed a bug in cl/600990001 -- we need to propagate the as_utf8 parameter tha...
• Additional commits viewable in compare view

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[bpandola]

Tests pass for me using latest protobuf version 5.26.1 on Python 3.9. Could we get this merged and a new release? Thank you!

[antechrestos]

@bpandola sorry for the late reply; I've made a 1.37.0 release with all dependabot suggestions :)

[bpandola]

@antechrestos Many thanks!