Pin spanner to old version in gcp bom (#37329)

Author: damccorm

sdks/java/bom/gcp/build.gradle

@@ -20,7 +20,17 @@ apply from: '../common.gradle'
 
 dependencies {
   api platform(project(":sdks:java:bom"))
-  api platform(project.library.java.google_cloud_platform_libraries_bom)
+  api platform(project.library.java.google_cloud_spanner_bom)
+  api platform(project.library.java.google_cloud_platform_libraries_bom) {
+    // TODO(https://github.com/apache/beam/issues/37328) remove exclude and google_cloud_spanner_bom after upstream and/or tests fixed
+    exclude group: "com.google.cloud", module: "google-cloud-spanner"
+    exclude group: "com.google.api.grpc", module: "proto-google-cloud-spanner-v1"
+    exclude group: "com.google.api.grpc", module: "proto-google-cloud-spanner-admin-instance-v1"
+    exclude group: "com.google.api.grpc", module: "proto-google-cloud-spanner-admin-database-v1"
+    exclude group: "com.google.api.grpc", module: "grpc-google-cloud-spanner-v1"
+    exclude group: "com.google.api.grpc", module: "grpc-google-cloud-spanner-admin-instance-v1"
+    exclude group: "com.google.api.grpc", module: "grpc-google-cloud-spanner-admin-database-v1"
+  }
   constraints {
     api project.library.java.guava
   }