chore: update libraries-bom to 4.4.0 (#98)

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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

@@ -1,19 +1,11 @@
 {
-  "updateTime": "2020-03-25T17:45:14.831622Z",
+  "updateTime": "2020-04-01T22:56:21.349883Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "1.1.1",
-        "dockerImage": "googleapis/artman@sha256:5ef340c8d9334719bc5c6981d95f4a5d2737b0a6a24f2b9a0d430e96fff85c5b"
-      }
-    },
-    {
-      "git": {
-        "name": "googleapis-private",
-        "remote": "https://github.com/googleapis/googleapis-private.git",
-        "sha": "e6378caa596533251006a9eb318f3f9e71984f2b",
-        "internalRef": "301441701"
+        "version": "1.2.0",
+        "dockerImage": "googleapis/artman@sha256:ef1a5b367dbe1e37cea1c7c814c801a638473e8dd66f87f4a2b8c2a146013673"
       }
     },
     {
@@ -27,20 +19,7 @@
       "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"
-      }
-    }
-  ],
-  "destinations": [
-    {
-      "client": {
-        "source": "googleapis-private",
-        "apiName": "gameservices",
-        "apiVersion": "v1alpha",
-        "language": "java",
-        "generator": "gapic",
-        "config": "google/cloud/gaming/artman_gameservices_v1alpha.yaml"
+        "sha": "e36822bfa0acb355502dab391b8ef9c4f30208d8"
       }
     }
   ]