fix: add missing /v1/ prefix in getEmbedUrl URL path (#645)

getEmbedUrl() builds the Embedded Card UI iframe URL via manual string
concatenation and was producing <baseUrl>/embed/card?... instead of
<baseUrl>/v1/embed/card?.... This is the same class of bug that was
fixed for getEmbedHtml() in commit 6659ab9, but getEmbedUrl() was
missed because it uses buildString rather than HttpRequest.builder()
with addPathSegments.

Author: tonymike99

lithic-java-core/src/main/kotlin/com/lithic/api/services/async/CardServiceAsyncImpl.kt

@@ -621,7 +621,7 @@ class CardServiceAsyncImpl internal constructor(private val clientOptions: Clien
         return buildString {
             append(clientOptions.baseUrl())
             if (!endsWith("/")) append("/")
-            append("embed/card")
+            append("v1/embed/card")
             append("?embed_request=")
             append(URLEncoder.encode(embed_request, "UTF-8"))
             append("&hmac=")

lithic-java-core/src/main/kotlin/com/lithic/api/services/blocking/CardServiceImpl.kt

@@ -556,7 +556,7 @@ class CardServiceImpl internal constructor(private val clientOptions: ClientOpti
         return buildString {
             append(clientOptions.baseUrl())
             if (!endsWith("/")) append("/")
-            append("embed/card")
+            append("v1/embed/card")
             append("?embed_request=")
             append(URLEncoder.encode(embed_request, "UTF-8"))
             append("&hmac=")