deps: update opencensus.version to v0.31.1 (#819)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [io.opencensus:opencensus-contrib-http-util](https://github.com/census-instrumentation/opencensus-java) | `0.31.0` -> `0.31.1` | [![age](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-contrib-http-util/0.31.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-contrib-http-util/0.31.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-contrib-http-util/0.31.1/compatibility-slim/0.31.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-contrib-http-util/0.31.1/confidence-slim/0.31.0)](https://docs.renovatebot.com/merge-confidence/) |
| [io.opencensus:opencensus-api](https://github.com/census-instrumentation/opencensus-java) | `0.31.0` -> `0.31.1` | [![age](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-api/0.31.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-api/0.31.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-api/0.31.1/compatibility-slim/0.31.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.opencensus:opencensus-api/0.31.1/confidence-slim/0.31.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>census-instrumentation/opencensus-java</summary>

### [`v0.31.1`](https://github.com/census-instrumentation/opencensus-java/releases/v0.31.1)

[Compare Source](https://github.com/census-instrumentation/opencensus-java/compare/v0.31.0...v0.31.1)

##### What's Changed

-   \[v0.31.x] Fix retry stat measures to match those in grpc-java exactly ([#&#8203;2097](https://github.com/census-instrumentation/opencensus-java/issues/2097))  by [@&#8203;mackenziestarr](https://github.com/mackenziestarr) in [https://github.com/census-instrumentation/opencensus-java/pull/2102](https://github.com/census-instrumentation/opencensus-java/pull/2102)

**Full Changelog**: census-instrumentation/opencensus-java@v0.31.0...v0.31.1

</details>

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java-core/pom.xml

@@ -160,7 +160,7 @@
     <google.http.version>1.41.7</google.http.version>
     <grpc.version>1.46.0</grpc.version>
     <protobuf.version>3.20.1</protobuf.version>
-    <opencensus.version>0.31.0</opencensus.version>
+    <opencensus.version>0.31.1</opencensus.version>
     <annotations-api.version>1.3.2</annotations-api.version>
     <guava.version>31.1-jre</guava.version>
     <junit.version>4.13.2</junit.version>