Bump com.android.tools.build:manifest-merger from 30.3.1 to 31.7.2 (#9528)

Context: https://mvnrepository.com/artifact/com.android.tools.build/manifest-merger/31.7.2
Context: https://android.googlesource.com/platform/tools/base/+/master/build-system/manifest-merger

I was not able to find a specific tag matching this release.

Other changes:

* Pass in `$(JavacSourceVersion)` and `$(JavacTargetVersion)` to the `gradle jar` task

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: jonathanpeppers

src/manifestmerger/build.gradle

@@ -19,7 +19,7 @@ repositories {
 
 dependencies {
     // https://mvnrepository.com/artifact/com.android.tools.build/manifest-merger
-    implementation 'com.android.tools.build:manifest-merger:30.3.1'
+    implementation 'com.android.tools.build:manifest-merger:31.7.2'
 }
 
 sourceSets {

src/manifestmerger/manifestmerger.targets

@@ -13,7 +13,7 @@
         WorkingDirectory="$(MSBuildThisFileDirectory)"
     />
     <Exec
-        Command="&quot;$(GradleWPath)&quot; jar $(GradleArgs)"
+        Command="&quot;$(GradleWPath)&quot; jar $(GradleArgs) -PjavaSourceVer=$(JavacSourceVersion) -PjavaTargetVer=$(JavacTargetVersion)"
         EnvironmentVariables="JAVA_HOME=$(JavaSdkDirectory);APP_HOME=$(GradleHome)"
         WorkingDirectory="$(MSBuildThisFileDirectory)"
     />