Fix image upload for content-type image

Author: Jonas1893

modules/openapi-generator/src/main/resources/swift5/libraries/urlsession/URLSessionImplementations.mustache

@@ -140,7 +140,7 @@ private var credentialStore = SynchronizedDictionary<Int, URLCredential>()
                 encoding = FormDataEncoding(contentTypeForFormPart: contentTypeForFormPart(fileURL:))
             } else if contentType.hasPrefix("application/x-www-form-urlencoded") {
                 encoding = FormURLEncoding()
-            } else if contentType.hasPrefix("application/octet-stream"){
+            } else if contentType.hasPrefix("application/octet-stream") || contentType.hasPrefix("image/") {
                 encoding = OctetStreamEncoding()
             } else {
                 fatalError("Unsupported Media Type - \(contentType)")

modules/openapi-generator/src/main/resources/swift6/libraries/urlsession/URLSessionImplementations.mustache

@@ -140,7 +140,7 @@ fileprivate class URLSessionRequestBuilderConfiguration: @unchecked Sendable {
                 encoding = FormDataEncoding(contentTypeForFormPart: contentTypeForFormPart(fileURL:))
             } else if contentType.hasPrefix("application/x-www-form-urlencoded") {
                 encoding = FormURLEncoding()
-            } else if contentType.hasPrefix("application/octet-stream"){
+            } else if contentType.hasPrefix("application/octet-stream") || contentType.hasPrefix("image/") {
                 encoding = OctetStreamEncoding()
             } else {
                 fatalError("Unsupported Media Type - \(contentType)")