chore: update libraries-bom to 4.4.1 (#117)

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

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

@@ -1,13 +1,12 @@
 {
-  "updateTime": "2020-04-05T08:56:54.576016Z",
+  "updateTime": "2020-04-07T00:07:16.962058Z",
   "sources": [
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
         "sha": "5077b1e4674afdbbf11dac3f5f43d36285ba53ff",
-        "internalRef": "304836531",
-        "log": "5077b1e4674afdbbf11dac3f5f43d36285ba53ff\nchore: set Ruby namespace in proto options\n\nPiperOrigin-RevId: 304836531\n\nd6cb4997910eda04c0c66c0f2fd043eeaa0f660d\nchore: enable gapic v2 and proto annotation for documentai API.\n\ncommitter @summer-ji-eng\n\nPiperOrigin-RevId: 304724866\n\n490bc556608bfa5b1548c9374b06152fa33d657e\nEnable gapicv2 for devtools/remoteworkers/v1test2\n\nCommitter: @miraleung\nPiperOrigin-RevId: 304718691\n\n9f78ce31a5bd7f4a63e3cf0ddf28221557adb7ed\nEnable gapicv2 for managedidentities/v1beta1\n\nCommitter: @miraleung\nPiperOrigin-RevId: 304718676\n\n6e17d259b8e320bc51aa240cefef05ec753e2b83\ndocs: treat a dummy example URL as a string literal instead of a link\n\nPiperOrigin-RevId: 304716376\n\na8d76f99d3073aaccabdcc122c798a63e812c4fe\ndocs: change relative URLs to absolute URLs to fix broken links.\n\nPiperOrigin-RevId: 304702368\n\n65c749bc6a1d240416a0e6979381b67f97aff907\ndocs: fix formatting of some regexes and string literals.\n\nPiperOrigin-RevId: 304701150\n\n9119eefcd2b5ce845a680fa4ec4093ed733498f0\nchore: set Ruby namespace in proto options\n\nPiperOrigin-RevId: 304698702\n\n62a2a7cc33d3535638d220df238823eefcca930d\nchore: set Ruby namespace in proto options\n\nPiperOrigin-RevId: 304696461\n\n23848c8f64a5e81a239d6133378468185f1756dc\nchore: set Ruby namespace in proto options\n\nPiperOrigin-RevId: 304696192\n\n9514fa9e390a4c0715972c5b510cf4c10ad049a1\ndocs: change relative URLs to absolute URLs to fix broken links.\n\nPiperOrigin-RevId: 304695334\n\n0f7b1509a9a452808c3d07fe90fedfcea763d7d5\nfix: change config_schema_version to 2.0.0 for containeranalysis v1 gapic config.\n\ncommitter: @hzyi-google\nPiperOrigin-RevId: 304672648\n\n3d52f3c126fbfc31f067a7f54737b7f0dfbce163\nDialogflow weekly v2 library update:\n- Change `parent` field's resource_reference to specify child_type instead of type per client library generation requirement;\n- Change Session with its child resource pattern to support both projects/{project}/agent/sessions/{session} and projects/{project}/agent/environments/{environment}/users/{user}/sessions/{session};\n- Fix `method_signature`\n- Regular documentation update\n\nImportant updates are also posted at:\nhttps://cloud.google.com/dialogflow/docs/release-notes\n\nPiperOrigin-RevId: 304635286\n\n4a6a01ce0ead505c245d11a2ce156de34800c58f\ndocs: change a relative URL to an absolute URL to fix broken links.\n\nPiperOrigin-RevId: 304633630\n\n"
+        "internalRef": "304836531"
       }
     },
     {