Switch to Anthropic -latest tags (#19615)

- Closes: https://github.com/zed-industries/zed/issues/19609

Switches us to using `-latest` tags with Anthropic models instead of
pinning to a specific date version.
See: [Anthropic Model
Docs](https://docs.anthropic.com/en/docs/about-claude/models)

This is a no-op for:
- Claude 3 Opus (`claude-3-opus-20240229`)
- Claude 3 Sonnet (`claude-3-sonnet-20240229`)
- Claude 3 Haiku (`claude-3-haiku-20240307`)

For Claude 3.5 Sonnet this will update us from
`claude-3-5-sonnet-20240620` to `claude-3-5-sonnet-20241022`. We will
also pickup any subsequent model updates automatically when Anthropic
updates the `latest` tag.

This matches the behavior for OpenAI where use `gpt-4o` as the
model_name and not `gpt-4o-2024-08-06`.

crates/language_model/src/provider/anthropic.rs

@@ -40,7 +40,7 @@ pub struct AnthropicSettings {
 
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 pub struct AvailableModel {
-    /// The model's name in the Anthropic API. e.g. claude-3-5-sonnet-20240620
+    /// The model's name in the Anthropic API. e.g. claude-3-5-sonnet-latest, claude-3-opus-20240229, etc
     pub name: String,
     /// The model's name in Zed's UI, such as in the model selector dropdown menu in the assistant panel.
     pub display_name: Option<String>,