Upgrade to Robolectric 4.10.3

We originally upgraded to 4.10 in 889f435a49

However I saw `ShadowActivityThread.reset: ActivityThread not set`
errors when running any Robolectric test, so I downgraded to 4.8.1:
85e449cd87

Nobody else on the team was seeing the same error with 4.10, so it was
something different about my local setup.

The error was actually masking a different problem (see discussion:
https://github.com/robolectric/robolectric/issues/8160). Upgrading to
4.10.1 made the underlying error clear:

```
java.lang.UnsatisfiedLinkError: /tmp/libconscrypt_openjdk_jni-linux-x86_6416831044223480000.so: libstdc++.so.6: cannot open shared object file: No such file or directory
```
This was then fixed by changing my 'Gradle JDK' value in Android Studio
from a JDK 11-based value to a 17-based one. If others see the same
`UnsatisfiedLinkError` when running the tests locally they should check
their Gradle JDK setting in Android Studio.

However there was **another** problem with 4.10 that **did** affect
everyone: some tests in `ExoPlayerTest` would fail with time outs or
assertion failures related to clock advancement.

After some investigation in https://github.com/robolectric/robolectric/issues/8187
it turns out this is because there's lots of unrelease `Player`
instances in `ExoPlayerTest`, which keep lots of active `HandlerThreads`
that then have to all be woken up by Robolectric. 4.10.3 has a fix that
mitigates this, so we can upgrade immediately - but we should also
release all the `Player` instances in `ExoPlayerTest` (it might speed
up test execution too).

PiperOrigin-RevId: 533068395

constants.gradle

@@ -29,7 +29,7 @@ project.ext {
     // https://cs.android.com/android/platform/superproject/+/master:external/guava/METADATA
     guavaVersion = '31.1-android'
     mockitoVersion = '3.12.4'
-    robolectricVersion = '4.8.1'
+    robolectricVersion = '4.10.3'
     // Keep this in sync with Google's internal Checker Framework version.
     checkerframeworkVersion = '3.13.0'
     checkerframeworkCompatVersion = '2.5.5'