chore: update libraries-bom to 4.4.1 (#136)

This git repo (https://github.com/googleapis/java-speech.git)
Git repo https://github.com/googleapis/googleapis.git
Git repo https://github.com/googleapis/synthtool.git

Author: yoshi-automation

README.md

@@ -17,7 +17,7 @@ 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>4.4.0</version>
+      <version>4.4.1</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>

synth.metadata

@@ -1,5 +1,5 @@
 {
-  "updateTime": "2020-04-02T00:22:33.680371Z",
+  "updateTime": "2020-04-07T00:41:57.072368Z",
   "sources": [
     {
       "git": {