fix: [google-cloud-documentai] Resolve AttributeError 'Credentials' object has no attribute 'universe_domain'

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BEGIN_COMMIT_OVERRIDE
fix: Resolve AttributeError 'Credentials' object has no attribute 'universe_domain'
fix: Add google-auth as a direct dependency
fix: Add staticmethod decorator to _get_client_cert_source and _get_api_endpoint
feat: expose model_type in v1 processor, so that user can see the model_type after get or list processor version
END_COMMIT_OVERRIDE

chore: Update gapic-generator-python to v1.14.1
PiperOrigin-RevId: 603728206

Source-Link: googleapis/googleapis@9063da8

Source-Link: https://github.com/googleapis/googleapis-gen/commit/891c67d0a855b08085eb301dabb14064ef4b2c6d
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWRvY3VtZW50YWkvLk93bEJvdC55YW1sIiwiaCI6Ijg5MWM2N2QwYTg1NWIwODA4NWViMzAxZGFiYjE0MDY0ZWY0YjJjNmQifQ==

BEGIN_NESTED_COMMIT
feat: [google-cloud-documentai] expose model_type in v1 processor, so that user can see the model_type after get or list processor version
PiperOrigin-RevId: 603727585

Source-Link: googleapis/googleapis@7a9a855

Source-Link: https://github.com/googleapis/googleapis-gen/commit/9643051150762c3e15d1cd420ddfb978a1b7c24c
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWRvY3VtZW50YWkvLk93bEJvdC55YW1sIiwiaCI6Ijk2NDMwNTExNTA3NjJjM2UxNWQxY2Q0MjBkZGZiOTc4YTFiN2MyNGMifQ==
END_NESTED_COMMIT
BEGIN_NESTED_COMMIT
feat: [google-cloud-documentai] add model_type in v1beta3 processor proto
PiperOrigin-RevId: 603726122

Source-Link: googleapis/googleapis@c7fd8bd

Source-Link: https://github.com/googleapis/googleapis-gen/commit/23bc05e699ad5701027589137be44d4a43091829
Copy-Tag: eyJwIjoicGFja2FnZXMvZ29vZ2xlLWNsb3VkLWRvY3VtZW50YWkvLk93bEJvdC55YW1sIiwiaCI6IjIzYmMwNWU2OTlhZDU3MDEwMjc1ODkxMzdiZTQ0ZDRhNDMwOTE4MjkifQ==
END_NESTED_COMMIT

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