deps: update project.http.version to v1.39.2 (#1748)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| com.google.http-client:google-http-client-findbugs | `1.39.0` -> `1.39.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-findbugs/1.39.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-findbugs/1.39.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-findbugs/1.39.2/compatibility-slim/1.39.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-findbugs/1.39.2/confidence-slim/1.39.0)](https://docs.renovatebot.com/merge-confidence/) |
| [com.google.http-client:google-http-client-bom](https://togithub.com/googleapis/google-http-java-client) | `1.39.0` -> `1.39.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-bom/1.39.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-bom/1.39.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-bom/1.39.2/compatibility-slim/1.39.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.http-client:google-http-client-bom/1.39.2/confidence-slim/1.39.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/google-http-java-client</summary>

### [`v1.39.2`](https://togithub.com/googleapis/google-http-java-client/blob/master/CHANGELOG.md#&#8203;1392-httpswwwgithubcomgoogleapisgoogle-http-java-clientcomparev1391v1392-2021-04-09)

[Compare Source](https://togithub.com/googleapis/google-http-java-client/compare/v1.39.1...v1.39.2)

### [`v1.39.1`](https://togithub.com/googleapis/google-http-java-client/blob/master/CHANGELOG.md#&#8203;1391-httpswwwgithubcomgoogleapisgoogle-http-java-clientcomparev1390v1391-2021-03-15)

[Compare Source](https://togithub.com/googleapis/google-http-java-client/compare/v1.39.0...v1.39.1)

</details>

---

### Configuration

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:no_bell: **Ignore**: Close this PR and you won't be reminded about these updates again.

---

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.kokoro/dependencies.sh

@@ -33,6 +33,7 @@ export MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=128m"
 retry_with_backoff 3 10 \
   mvn install -B -V -ntp \
     -DskipTests=true \
+    -Dmaven.javadoc.skip=true \
     -Dclirr.skip=true
 
 mvn -B dependency:analyze -DfailOnWarning=true

pom.xml

@@ -480,7 +480,7 @@
   </build>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <project.http.version>1.39.0</project.http.version>
+    <project.http.version>1.39.2</project.http.version>
     <project.httpcore.version>4.4.14</project.httpcore.version>
     <project.httpclient.version>4.5.13</project.httpclient.version>
     <project.oauth.version>1.31.4</project.oauth.version>