Bump download-maven-plugin from 1.6.7 to 1.6.8#80

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dependabot/maven/master/com.googlecode.maven-download-plugin-download-maven-plugin-1.6.8HeimingZ/iotdb:dependabot/maven/master/com.googlecode.maven-download-plugin-download-maven-plugin-1.6.8Copy head branch name to clipboard