chore: remove All rights reserved clause from java.header (#1441)

After discussion with OSPO, it has been decided to remove "All rights reserved" clause from the java.header file to better reflect the [correct license header](https://g3doc.corp.google.com/company/teams/opensource/releasing/preparing.md?cl=head#Apache-header).

Source-Author: Neenu Shaji <[email protected]>
Source-Date: Thu Jul 8 18:00:44 2021 -0400
Source-Repo: googleapis/synthtool
Source-Sha: 09c59c20a4bf0daed1665af59035ff240fe356df
Source-Link: googleapis/synthtool@09c59c2

Author: yoshi-automation

java.header

@@ -1,5 +1,5 @@
 ^/\*$
-^ \* Copyright \d\d\d\d,? Google (Inc\.|LLC)( All [rR]ights [rR]eserved\.)?$
+^ \* Copyright \d\d\d\d,? Google (Inc\.|LLC)$
 ^ \*$
 ^ \* Licensed under the Apache License, Version 2\.0 \(the "License"\);$
 ^ \* you may not use this file except in compliance with the License\.$

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquery.git",
-        "sha": "c9c948127fa7a07661809698c18b1850207a3479"
+        "sha": "526c517f1940007e532c7e1f7e1fa01a985f30e2"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "1c0c698705e668ccb3d68556ae7260f16ce63a6e"
+        "sha": "09c59c20a4bf0daed1665af59035ff240fe356df"
       }
     }
   ],