Release - 0.49.1

[calvincestari]

Diff

Example: 0.49.0...main.

Relevant changes:

• Public initializer for ApolloSchemaDownloadConfiguration.HTTPHeader (Make initializer for ApolloSchemaDownloadConfiguration.HTTPHeader public #1962)

Things to do in this PR

• Update the version in Configuration/Shared/Project-Version.xcconfig.
• Update CHANGELOG.md with all relevant changes since the prior version. Please include PR numbers and mention contributors for external PR submissions.
• Run the Documentation Generator as noted in api-reference.md to re-generate documentation from source for all included libraries.

Other things to do before a release - these need to be automated by CI

• Validate that main builds with a test Swift Package Manager project.
• Validate that main builds with a test CocoaPods project.
• Validate that main builds with a test Carthage project (make sure to use --use-xcframeworks).

Things to do as part of releasing

• Add tag of format major.minor.patch to GitHub for SPM/Carthage.
• Create a release on GitHub with the new tag, using the latest CHANGELOG.md contents.
• Run pod trunk push Apollo.podspec to publish to CocoaPods. You will need write permissions for this, please contact one of the maintainers if you need access to do this.
• Announce the new version (Twitter, etc.)

Things to do after release - these need to be automated by CI

• Update to the new version of apollo-ios in the sample application.
• Update to the new version of apollo-ios in the codegen template.
• Make sure all playground pages still execute.

[calvincestari]

Publicly announced at https://twitter.com/c35tar1/status/1441530271078121473?s=20.