Upgrade spotbugs-gradle-plugin from 4.7.1 to 4.7.3 (#684)

Author: tokuhirom

build.gradle

@@ -33,7 +33,7 @@ buildscript {
     dependencies {
         classpath 'com.github.ben-manes:gradle-versions-plugin:0.39.0'
         classpath 'com.puppycrawl.tools:checkstyle:8.45.1'
-        classpath 'gradle.plugin.com.github.spotbugs.snom:spotbugs-gradle-plugin:4.7.1'
+        classpath 'gradle.plugin.com.github.spotbugs.snom:spotbugs-gradle-plugin:4.7.3'
         classpath 'io.franzbecker:gradle-lombok:4.0.0'
         classpath 'io.spring.gradle:dependency-management-plugin:1.0.11.RELEASE'
         classpath "org.springframework.boot:spring-boot-gradle-plugin:$spring_boot_version"

config/findbugs/excludeFilter.xml

@@ -13,4 +13,11 @@
     <Class name="com.linecorp.bot.client.IntegrationTestSettings" />
     <Bug pattern="RCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE" />
   </Match>
+
+  <Match>
+    <Bug pattern="EI_EXPOSE_REP2" />
+  </Match>
+  <Match>
+    <Bug pattern="EI_EXPOSE_REP" />
+  </Match>
 </FindBugsFilter>