build(java): skip javadoc tests during dependencies test (#432)

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Source-Link: googleapis/synthtool@5b0e159

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-resourcemanager.git",
-        "sha": "102787558cf71ee283edc28c671503929fdc6b2e"
+        "sha": "b3f53537ab83aed1afb065d49553649893e7f89e"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "572ef8f70edd9041f5bcfa71511aed6aecfc2098"
+        "sha": "5b0e1592dd7d70b485e157ea4b3eb1704ecbd015"
       }
     }
   ],