Revert "Upgrade OkHttp to 5.0.0 and Kotlin to 2.2.0 and removed @ignore testcases."

[pmathew92]

Reverts #911

[Copilot]

Pull request overview

Reverts the prior dependency upgrade PR by downgrading Kotlin/OkHttp and aligning production/test code and docs back to OkHttp 4.x + MockWebServer 4.x APIs.

Changes:

• Downgrade Kotlin Gradle plugin version to 2.0.21 and OkHttp to 4.12.0.
• Replace OkHttp 5 mockwebserver3 usages with OkHttp 4 okhttp3.mockwebserver APIs across the test suite.
• Update docs (V4 migration guide) to reflect the reverted Kotlin/OkHttp versions and remove now-irrelevant upgrade notes.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
build.gradle	Reverts kotlin_version to 2.0.21.
auth0/build.gradle	Reverts OkHttp to 4.12.0 and switches test dependency to mockwebserver.
auth0/src/test/java/com/auth0/android/util/SSLTestUtils.kt	Updates MockWebServer import and useHttps signature for OkHttp 4.
auth0/src/test/java/com/auth0/android/util/AuthenticationAPIMockServer.kt	Reverts MockResponse construction to OkHttp 4-style setters.
auth0/src/test/java/com/auth0/android/util/APIMockServer.kt	Reverts MockWebServer/MockResponse usage and uses shutdown().
auth0/src/test/java/com/auth0/android/request/internal/ThreadSwitcherShadow.java	Adjusts shadow behavior by removing the mainThread implementation.
auth0/src/test/java/com/auth0/android/request/DefaultClientTest.kt	Reverts MockWebServer APIs (path, shutdown, response setters, body reading).
auth0/src/test/java/com/auth0/android/provider/WebAuthProviderTest.kt	Reintroduces ignored tests + switches JWKS mocking to MockWebServer; removes ConscryptMode usage.
auth0/src/test/java/com/auth0/android/myaccount/MyAccountAPIClientTest.kt	Reverts RecordedRequest API usage (path, getHeader, readUtf8).
auth0/src/test/java/com/auth0/android/management/UsersAPIClientTest.kt	Reverts RecordedRequest API usage (path, getHeader, readUtf8).
auth0/src/test/java/com/auth0/android/authentication/MfaApiClientTest.kt	Reverts MockWebServer/MockResponse usage and request assertions (path, getHeader).
auth0/src/test/java/com/auth0/android/authentication/AuthenticationAPIClientTest.kt	Reverts RecordedRequest assertions (path, getHeader, readUtf8).
auth0/src/main/java/com/auth0/android/request/internal/OidcUtils.kt	Switches scope normalization back to toLowerCase(Locale.ROOT).
auth0/src/main/java/com/auth0/android/provider/WebAuthProvider.kt	Switches scheme normalization back to toLowerCase(Locale.ROOT).
V4_MIGRATION_GUIDE.md	Updates Kotlin version guidance and removes OkHttp 5 upgrade notes.

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[Copilot]

Spelling: "Roboelectric" should be "Robolectric" in the @ignore reason string.

Suggested change

	@Ignore("Fix these failing tests in CI once Roboelectric and other dependencies are updated")
	@Ignore("Fix these failing tests in CI once Robolectric and other dependencies are updated")

[Copilot]

String.toLowerCase(Locale) is deprecated in Kotlin; prefer lowercase(Locale.ROOT) to avoid deprecation warnings and future compatibility issues.

Suggested change

	.map { it.toLowerCase(Locale.ROOT) }
	.map { it.lowercase(Locale.ROOT) }

[Copilot]

String.toLowerCase(Locale) is deprecated in Kotlin; prefer lowercase(Locale.ROOT) to avoid deprecation warnings and future compatibility issues.

Suggested change

	val lowerCase = scheme.toLowerCase(Locale.ROOT)
	val lowerCase = scheme.lowercase(Locale.ROOT)

[Copilot]

String.toLowerCase(Locale) is deprecated in Kotlin; prefer lowercase(Locale.ROOT) to avoid deprecation warnings and future compatibility issues.

Suggested change

	val lowerCase = scheme.toLowerCase(Locale.ROOT)
	val lowerCase = scheme.lowercase(Locale.ROOT)

[Copilot]

Spelling: "Roboelectric" should be "Robolectric" in the @ignore reason string.

Suggested change

	@Ignore("Fix these failing tests in CI once Roboelectric and other dependencies are updated")
	@Ignore("Fix these failing tests in CI once Robolectric and other dependencies are updated")