fix: make generate_index_ts() deterministic (#1104)

Fixes googleapis/synthtool#1103
Source-Link: googleapis/synthtool@c3e41da
Post-Processor: gcr.io/repo-automation-bots/owlbot-nodejs:latest@sha256:e37a815333a6f3e14d8532efe90cba8aa0d34210f8c0fdbdd9e6a34dcbe51e96

.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/repo-automation-bots/owlbot-nodejs:latest
-  digest: sha256:f4734af778c3d0eb58a6db0078907a87f2e53f3c7a6422363fc37ee52e02b25a
+  digest: sha256:e37a815333a6f3e14d8532efe90cba8aa0d34210f8c0fdbdd9e6a34dcbe51e96

src/index.ts

@@ -16,22 +16,22 @@
 // ** https://github.com/googleapis/synthtool **
 // ** All changes to this file may be overwritten. **
 
+import * as v1 from './v1';
+import * as v1p1beta1 from './v1p1beta1';
+import * as v1p2beta1 from './v1p2beta1';
 import * as v1p4beta1 from './v1p4beta1';
 import * as v1p5beta1 from './v1p5beta1';
-import * as v1p2beta1 from './v1p2beta1';
-import * as v1p1beta1 from './v1p1beta1';
-import * as v1 from './v1';
 
 const AssetServiceClient = v1.AssetServiceClient;
 type AssetServiceClient = v1.AssetServiceClient;
 
-export {v1p4beta1, v1p5beta1, v1p2beta1, v1p1beta1, v1, AssetServiceClient};
+export {v1, v1p1beta1, v1p2beta1, v1p4beta1, v1p5beta1, AssetServiceClient};
 export default {
+  v1,
+  v1p1beta1,
+  v1p2beta1,
   v1p4beta1,
   v1p5beta1,
-  v1p2beta1,
-  v1p1beta1,
-  v1,
   AssetServiceClient,
 };
 import * as protos from '../protos/protos';