chore: update libraries-bom to 4.4.0 (#130)

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Synth log will be available here:
https://source.cloud.google.com/results/invocations/46cdbcfa-1e99-4e4f-be05-90f447630a24/targets

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

synth.metadata

@@ -1,11 +1,11 @@
 {
-  "updateTime": "2020-03-25T16:41:46.963878Z",
+  "updateTime": "2020-04-01T21:57:07.147195Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "1.1.1",
-        "dockerImage": "googleapis/artman@sha256:5ef340c8d9334719bc5c6981d95f4a5d2737b0a6a24f2b9a0d430e96fff85c5b"
+        "version": "1.2.0",
+        "dockerImage": "googleapis/artman@sha256:ef1a5b367dbe1e37cea1c7c814c801a638473e8dd66f87f4a2b8c2a146013673"
       }
     },
     {
@@ -37,16 +37,14 @@
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
         "sha": "0e07113e776bdd8fcc0783372e08bb6e76cb1b5b",
-        "internalRef": "302892245",
-        "log": "0e07113e776bdd8fcc0783372e08bb6e76cb1b5b\ndocs: Update documentation with links to smart home developer guides and reference pages. Remove outdated authorization instructions.\n\nPiperOrigin-RevId: 302892245\n\n"
+        "internalRef": "302892245"
       }
     },
     {
       "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"
       }
     }
   ],