Edge case where R8 removes the TypeToken's generic type (while consuming the library's recently updated proguard rules)

(Originally reported [here](https://github.com/google/gson/issues/2401#issuecomment-2009588140)).

# Gson version
2.10.1 + [those](https://github.com/google/gson/blob/main/gson/src/main/resources/META-INF/proguard/gson.pro) proguard rules.

# Java / Android version
I have tested on Android 34.

# Used tools
- [x] Gradle; version: 8.2
- [x] R8; version: 8.2.47

# Description
@Marcono1234 First of all thanks a lot for introducing consumer proguard rules!

I have added the rules to one of my projects. Everything seemed to work fine, but I ran into one issue.
Here's a sample code that makes use of Gson's TypeToken:
```
private List getData() {
String input = "[{\"value\": \"data\"}]";
Type type = new TypeToken>() { }.getType();
return new Gson().fromJson(input, type);
}
```
`MyImplementation` class implements the `MyInterface` interface, and this is its only usage in code.

Upon minification, R8 removes the `MyImplementation` class completely, while `TypeToken` is being left with `java.lang.Object` as its generic argument:
```
.class Linfo/osom/typetokenminify/a;
.super Lh/a;
.source "SourceFile"

# annotations
.annotation system Ldalvik/annotation/Signature;
value = {
"Lh/a<",
"Ljava/util/List<",
"Ljava/lang/Object;",
">;>;"
}
.end annotation
```
This, in turn, causes a runtime exception:
```
Caused by: java.lang.ClassCastException
at c.a.a(SourceFile:1)
at info.osom.typetokenminify.MainActivity.onCreate(SourceFile:163)
```

As a workaround, I currently have to explicitly keep the class:
```
-keep,allowobfuscation,allowoptimization class info.osom.typetokenminify.MyImplementation {
@com.google.gson.annotations.SerializedName ;
}
```
I'm wondering if more general rule can be used in such cases.

## Expected behavior
Run the application without errors.

## Actual behavior
The application crash at runtime.

# Reproduction steps
I have uploaded a [sample project](https://github.com/alipov/typetoken-minify) for demonstration.