cargo: bump buddy_system_allocator from 0.12.0 to 0.13.0 in /src/bare-metal/alloc-example (#3138)

Bumps
[buddy_system_allocator](https://github.com/rcore-os/buddy_system_allocator)
from 0.12.0 to 0.13.0.

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/bare-metal/alloc-example/Cargo.lock

@@ -7,7 +7,7 @@ edition = "2024"
 publish = false
 
 [dependencies]
-buddy_system_allocator = "0.12.0"
+buddy_system_allocator = "0.13.0"
 panic-halt = "1.0.0"
 
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