finalize appengine api sdk to 1.9.86 (#2087)

@suztomo @ludoch This is the version that will be linked to by Beam 2.30 via libraries-bom 20.0.0. This is also the version we will have to patch if there's a P0 bug.

Co-authored-by: Tomo Suzuki <suztomo@google.com>

Author: elharo

boms/cloud-lts-bom/pom.xml

@@ -51,7 +51,6 @@
     <!-- interrim placeholder versions -->
     <!-- TODO: For each library, update the versions to the LTS version -->
     <beam.version>2.28.0</beam.version>
-    <appengine.api.1.0.sdk.version>1.9.87</appengine.api.1.0.sdk.version>
     <datastore.v1.proto.client.version>1.6.3</datastore.v1.proto.client.version>
     <google.cloud.bigtable.version>1.21.2</google.cloud.bigtable.version>
     <google.cloud.bigtable.client.version>1.19.1</google.cloud.bigtable.client.version>
@@ -77,6 +76,7 @@
     <google.cloud.pubsub.version>1.111.0-sp.1</google.cloud.pubsub.version>
     <google.cloud.bigquery.version>1.127.12-sp.1</google.cloud.bigquery.version>
     <google.cloud.storage.version>1.113.14-sp.1</google.cloud.storage.version>
+    <appengine.api.1.0.sdk.version>1.9.86</appengine.api.1.0.sdk.version>
     <androidpublisher.version>v3-rev20210429-1.31.0</androidpublisher.version>
   </properties>