chore: update libraries-bom to 4.4.0 (#105)

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https://source.cloud.google.com/results/invocations/46cdbcfa-1e99-4e4f-be05-90f447630a24/targets

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>4.3.0</version>
+      <version>4.4.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>

synth.metadata

@@ -1,21 +1,19 @@
 {
-  "updateTime": "2020-03-25T17:47:59.944148Z",
+  "updateTime": "2020-04-01T23:00:35.809297Z",
   "sources": [
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
         "sha": "fd83ab212176a1042e8d45ea90766b3bf59ac679",
-        "internalRef": "302913609",
-        "log": "fd83ab212176a1042e8d45ea90766b3bf59ac679\nfix: migrate osconfig/agentendpoint/v1 go_gapic_library target to microgen impl\n\nPiperOrigin-RevId: 302913609\n\n0e07113e776bdd8fcc0783372e08bb6e76cb1b5b\ndocs: Update documentation with links to smart home developer guides and reference pages. Remove outdated authorization instructions.\n\nPiperOrigin-RevId: 302892245\n\n"
+        "internalRef": "302913609"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "e36822bfa0acb355502dab391b8ef9c4f30208d8",
-        "log": "e36822bfa0acb355502dab391b8ef9c4f30208d8\nchore(java): treat samples shared configuration dependency update as chore (#457)\n\n\n1b4cc80a7aaf164f6241937dd87f3bd1f4149e0c\nfix: do not run node 8 CI (#456)\n\n\n"
+        "sha": "e36822bfa0acb355502dab391b8ef9c4f30208d8"
       }
     }
   ],