Update Rust crate xmrs to 0.6 (#716)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [xmrs](https://codeberg.org/sbechet/xmrs) | dependencies | minor |
`0.5` -> `0.6` |

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tracker/agb-xm-core/Cargo.toml

@@ -16,4 +16,4 @@ syn = "2"
 agb_tracker_interop = { version = "0.20.2", path = "../agb-tracker-interop" }
 agb_fixnum = { version = "0.20.2", path = "../../agb-fixnum" }
 
-xmrs = "0.5"
+xmrs = "0.6"