Bump spotbugs-gradle-plugin from 4.7.2 to 4.7.3

Bumps spotbugs-gradle-plugin from 4.7.2 to 4.7.3.

---
updated-dependencies:
- dependency-name: gradle.plugin.com.github.spotbugs.snom:spotbugs-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -20,7 +20,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:4.2.2'
         classpath 'com.hiya:jacoco-android:0.2'
-        classpath 'gradle.plugin.com.github.spotbugs.snom:spotbugs-gradle-plugin:4.7.2'
+        classpath 'gradle.plugin.com.github.spotbugs.snom:spotbugs-gradle-plugin:4.7.3'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "io.gitlab.arturbosch.detekt:detekt-gradle-plugin:1.18.0"
         classpath "commons-httpclient:commons-httpclient:3.1@jar" // remove after entire switch to lib v2