build: skip Maven download logs (#361)

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Synth log will be available here:
https://source.cloud.google.com/results/invocations/8440e2da-528d-412a-bf89-385b5618d6dd/targets

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Source-Link: googleapis/synthtool@1aeca92

Author: yoshi-automation

.kokoro/build.sh

@@ -60,6 +60,7 @@ javadoc)
     ;;
 integration)
     mvn -B ${INTEGRATION_TEST_ARGS} \
+      -ntp \
       -Penable-integration-tests \
       -DtrimStackTrace=false \
       -Dclirr.skip=true \
@@ -81,6 +82,7 @@ samples)
         pushd ${SAMPLES_DIR}
         mvn -B \
           -Penable-samples \
+          -ntp \
           -DtrimStackTrace=false \
           -Dclirr.skip=true \
           -Denforcer.skip=true \

synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-spanner-jdbc.git",
-        "sha": "3d4647f9fa748ed3c437f2d0f458e32403cea8d6"
+        "sha": "a5862a5572721fc898cf9b5f4ab8b99631848110"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "b416a7befcdbc42de41cf387dcf428f894fb812b"
+        "sha": "1aeca92e4a38f47134cb955f52ea76f84f09ff88"
       }
     }
   ],