chore(deps): update dependency com.google.cloud:libraries-bom to v5 (#…

…137)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:libraries-bom](https://togithub.com/GoogleCloudPlatform/cloud-opensource-java) | major | `4.4.1` -> `5.1.0` |

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Source-Author: WhiteSource Renovate <bot@renovateapp.com>
Source-Date: Tue Apr 14 19:54:23 2020 +0200
Source-Repo: googleapis/java-datalabeling
Source-Sha: 04ecc7f
Source-Link: 04ecc7f

README.md

@@ -20,7 +20,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>4.4.1</version>
+      <version>5.1.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>

synth.metadata

@@ -1,11 +1,10 @@
 {
-  "updateTime": "2020-04-09T09:18:28.564812Z",
   "sources": [
     {
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-datalabeling.git",
-        "sha": "d4502972f7055d5928dc25aa0a09b94f571ca983"
+        "sha": "04ecc7f4b930ef529f4241683849b225de14eb72"
       }
     },
     {