Swap out JWT for Oauth

[DBugger32]

No description provided.

[Copilot]

Pull request overview

This PR migrates the SDK’s authentication mechanism from JWT exchange to OAuth client-credentials, updating both the runtime token acquisition and the test/fixture setup accordingly.

Changes:

• Replaces JwtProvider with OauthProvider and updates operations to request OAuth access tokens for API calls.
• Simplifies Credentials / CredentialsBuilder to only handle client_id and client_secret, updating fixtures and tests to match.
• Updates dependency/CI configuration (notably removing the jwt gem), with a noted Ruby version support mismatch needing alignment.

Reviewed changes

Copilot reviewed 20 out of 22 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/pdf_services_sdk/test_ocr.rb	Updates token stub from JWT exchange to OAuth token endpoint.
test/pdf_services_sdk/test_oauth_provider.rb	Adds unit tests covering OAuth token retrieval and error handling.
test/pdf_services_sdk/test_jwt_provider.rb	Removes JWT provider tests (JWT auth no longer used).
test/pdf_services_sdk/test_html_to_pdf.rb	Updates token stub from JWT exchange to OAuth token endpoint.
test/pdf_services_sdk/test_document_merge.rb	Updates token stub from JWT exchange to OAuth token endpoint.
test/pdf_services_sdk/test_credentials.rb	Updates credentials expectations after removing JWT-era fields.
test/pdf_services_sdk/test_credentials_builder.rb	Updates builder tests after removing JWT-era fields and nested JSON parsing.
test/fixtures/valid_oauth_response.json	Adds fixture for a successful OAuth token response.
test/fixtures/invalid_oauth_response.json	Adds fixture for an OAuth token error response.
test/fixtures/files/pdfservices-api-credentials.json	Simplifies credentials JSON structure to client_id / client_secret.
pdfservices-ruby-sdk.gemspec	Removes jwt dependency; updates required Ruby version (needs alignment with CI matrix).
lib/pdfservices/ocr/operation.rb	Switches Authorization header token source to OauthProvider.
lib/pdfservices/oauth_provider.rb	Adds OAuth client-credentials token provider implementation.
lib/pdfservices/jwt_provider.rb	Removes JWT provider implementation (no longer used).
lib/pdfservices/html_to_pdf/operation.rb	Switches Authorization header token source to OauthProvider.
lib/pdfservices/document_merge/operation.rb	Switches Authorization header token source to OauthProvider.
lib/pdfservices/credentials.rb	Removes JWT-era credential fields; keeps only client id/secret.
lib/pdfservices/credentials_builder.rb	Updates builder to parse simplified credentials JSON and build reduced Credentials.
lib/pdfservices.rb	Removes jwt require and swaps autoload from JwtProvider to OauthProvider.
Gemfile.lock	Removes jwt and updates lockfile dependency set.
.github/workflows/main.yml	Updates CI Ruby matrix (adds 3.4/3.3; still includes 3.2).

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