fix: Make retry policy back off more aggressively for RPCs that retry RESOURCE_EXHAUSTD (#1704)

* fix: Make retry policy back off more aggressively for RPCs that retry RESOURCE_EXHAUSTD

PiperOrigin-RevId: 557935020

Source-Link: googleapis/googleapis@38e1f31

Source-Link: https://github.com/googleapis/googleapis-gen/commit/5bbe39d37218a420b2368c37541de5887db7d6af
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java

@@ -654,7 +654,7 @@ public static class Builder extends StubSettings.Builder<PublisherStubSettings,
       settings =
           RetrySettings.newBuilder()
               .setInitialRetryDelay(Duration.ofMillis(100L))
-              .setRetryDelayMultiplier(1.3)
+              .setRetryDelayMultiplier(4.0)
               .setMaxRetryDelay(Duration.ofMillis(60000L))
               .setInitialRpcTimeout(Duration.ofMillis(60000L))
               .setRpcTimeoutMultiplier(1.0)

google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/stub/SubscriberStubSettings.java

@@ -603,7 +603,7 @@ public static class Builder extends StubSettings.Builder<SubscriberStubSettings,
       settings =
           RetrySettings.newBuilder()
               .setInitialRetryDelay(Duration.ofMillis(100L))
-              .setRetryDelayMultiplier(1.3)
+              .setRetryDelayMultiplier(4.0)
               .setMaxRetryDelay(Duration.ofMillis(60000L))
               .setInitialRpcTimeout(Duration.ofMillis(900000L))
               .setRpcTimeoutMultiplier(1.0)