Fix typo in jdk-download testKit build.gradle

This commit fixes a typo in the jdk-download testKit build.gradle file
where "architecture" was not spelled correctly.

buildSrc/src/testKit/jdk-download/reuse/build.gradle

@@ -7,6 +7,6 @@ jdks {
     vendor = fakeJdkVendor
     version = fakeJdkVersion
     platform = "linux"
-    architeecture = "x64"
+    architecture = "x64"
   }
 }