"Bearer" authorization token prefix is misspelled in IssuanceAccessToken

[srosenda]

The prefix should be spelled exactly as "Bearer", not "BEARER" as in

eudi-lib-ios-openid4vci-swift/Sources/Entities/IssuanceAccessToken.swift

Lines 54 to 72 in ac62cca

	public extension IssuanceAccessToken {
	var authorizationHeader: [String: String] {
	["Authorization": "BEARER \(accessToken)"]
	}
	func dPoPOrBearerAuthorizationHeader(
	dpopConstructor: DPoPConstructorType?,
	endpoint: URL?
	) throws -> [String: String] {
	if tokenType == TokenType.bearer {
	return ["Authorization": "BEARER \(accessToken)"]
	} else if let dpopConstructor, tokenType == TokenType.dpop, let endpoint {
	return [
	"Authorization": "DPoP \(accessToken)",
	"DPoP": try dpopConstructor.jwt(endpoint: endpoint, accessToken: accessToken)
	]
	}
	return ["Authorization": "BEARER \(accessToken)"]
	}

See https://datatracker.ietf.org/doc/html/rfc6750#section-2.1. Fix available in PR #51.

[srosenda]

Note that OAuth implementations should in fact accept the authentication scheme "Bearer" spelled with any mix of lower- and uppercase characters. See openid/OpenID4VCI#371 (comment) and discussion linked to it.