Use buildvcs=false in release script

Follow up on #20847 and #20950, which tried to fix the issue. However,
the release script calls `./build` straight, not the make target nor
`scripts/build-binary.sh`. Therefore, this change straight in
`scripts/release.sh` addresses the version reported in the released
binary.

Signed-off-by: Ivan Valdes <ivan@vald.es>

Author: ivanvc

scripts/release.sh

@@ -124,7 +124,7 @@ main() {
     fi
 
     log_callout "Building etcd and checking --version output"
-    ./build
+    GO_BUILD_FLAGS="-v -buildvcs=false" ./build
     local etcd_version
     etcd_version=$(bin/etcd --version | grep "etcd Version" | awk '{ print $3 }')
     if [[ "${etcd_version}" != "${VERSION}" ]]; then