build: skip Maven download logs (#379)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/62fbd93a-0469-4c6e-9547-84dbcc2a707d/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@1aeca92

Author: yoshi-automation

java-core/.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 \

java-core/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-core.git",
-        "sha": "83a73d766160baa53fc0dc1e385e4456a4300b65"
+        "sha": "b0c0a20301fd324cc2cbc7f2da65521232cb367a"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "b416a7befcdbc42de41cf387dcf428f894fb812b"
+        "sha": "1aeca92e4a38f47134cb955f52ea76f84f09ff88"
       }
     }
   ],