build(deps): bump os-maven-plugin from 1.4.1.Final to 1.7.1

Bumps [os-maven-plugin](https://github.com/trustin/os-maven-plugin) from 1.4.1.Final to 1.7.1.
- [Release notes](https://github.com/trustin/os-maven-plugin/releases)
- [Commits](trustin/os-maven-plugin@os-maven-plugin-1.4.1.Final...os-maven-plugin-1.7.1)

---
updated-dependencies:
- dependency-name: kr.motd.maven:os-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

contrib/grpc-contrib/pom.xml

@@ -77,7 +77,7 @@
             <extension>
                 <groupId>kr.motd.maven</groupId>
                 <artifactId>os-maven-plugin</artifactId>
-                <version>1.4.1.Final</version>
+                <version>1.7.1</version>
             </extension>
         </extensions>
         <plugins>

contrib/grpc-spring/pom.xml

@@ -85,7 +85,7 @@
             <extension>
                 <groupId>kr.motd.maven</groupId>
                 <artifactId>os-maven-plugin</artifactId>
-                <version>1.4.1.Final</version>
+                <version>1.7.1</version>
             </extension>
         </extensions>
         <plugins>

demos/grpc-java-contrib-demo/time-client-demo/pom.xml

@@ -36,7 +36,7 @@
             <extension>
                 <groupId>kr.motd.maven</groupId>
                 <artifactId>os-maven-plugin</artifactId>
-                <version>1.4.1.Final</version>
+                <version>1.7.1</version>
             </extension>
         </extensions>
         <plugins>

demos/grpc-java-contrib-demo/time-service-demo/pom.xml

@@ -65,7 +65,7 @@
             <extension>
                 <groupId>kr.motd.maven</groupId>
                 <artifactId>os-maven-plugin</artifactId>
-                <version>1.4.1.Final</version>
+                <version>1.7.1</version>
             </extension>
         </extensions>
         <plugins>

jprotoc/jprotoc-test/pom.xml

@@ -82,7 +82,7 @@
             <extension>
                 <groupId>kr.motd.maven</groupId>
                 <artifactId>os-maven-plugin</artifactId>
-                <version>1.4.1.Final</version>
+                <version>1.7.1</version>
             </extension>
         </extensions>