anthropic: Fix license (#23867)

This PR fixes the license for the `anthropic` crate.

It was mistakenly licensed as AGPL, despite being used outside of
collab. It should be licensed as GPL.

Release Notes:

- N/A

crates/anthropic/Cargo.toml

@@ -3,7 +3,7 @@ name = "anthropic"
 version = "0.1.0"
 edition.workspace = true
 publish.workspace = true
-license = "AGPL-3.0-or-later"
+license = "GPL-3.0-or-later"
 
 [features]
 default = []

crates/anthropic/LICENSE-AGPL

@@ -1 +0,0 @@
-../../LICENSE-AGPL

crates/anthropic/LICENSE-GPL

@@ -0,0 +1 @@
+../../LICENSE-GPL