build(java): skip javadoc tests during dependencies test (#1336)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/e2a34b1c-bf5a-40fb-90d2-d348c259d27f/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

Source-Link: googleapis/synthtool@5b0e159

.kokoro/dependencies.sh

@@ -33,6 +33,7 @@ export MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=128m"
 retry_with_backoff 3 10 \
   mvn install -B -V -ntp \
     -DskipTests=true \
+    -Dmaven.javadoc.skip=true \
     -Dclirr.skip=true
 
 mvn -B dependency:analyze -DfailOnWarning=true

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-http-java-client.git",
-        "sha": "83400cd73a9852f7bdbb7dd09266894de81fa2b2"
+        "sha": "f1017c9df6925a7c204c31b02544032937f0b101"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "572ef8f70edd9041f5bcfa71511aed6aecfc2098"
+        "sha": "5b0e1592dd7d70b485e157ea4b3eb1704ecbd015"
       }
     }
   ],