bump min_sdk_version from 29 (Q) to 30 (R)

Mainline no longer supports Q.
These files were recently moved into p/m/C as part of a refactor.

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I0f06ace921db6c79d63c0048bdb73d167ff606cf
diff --git a/staticlibs/client-libs/tests/unit/Android.bp b/staticlibs/client-libs/tests/unit/Android.bp
index 220a6c1..03e3e70 100644
--- a/staticlibs/client-libs/tests/unit/Android.bp
+++ b/staticlibs/client-libs/tests/unit/Android.bp
@@ -8,7 +8,7 @@
         "src/**/*.java",
         "src/**/*.kt",
     ],
-    min_sdk_version: "29",
+    min_sdk_version: "30",
     static_libs: [
         "androidx.test.rules",
         "mockito-target-extended-minus-junit4",