Add announcements and infra updates

Author: phil-opp

content/this-month/2025-03/index.md

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+- [Rust, compiled to Holy C, running on TempleOS](https://www.reddit.com/r/rust/comments/1jp9227/media_rust_compiled_to_holly_c_running_on_templeos/)
+- [My non-unix like rust OS SafaOS, now has a rust libstd port](https://www.reddit.com/r/rust/comments/1jkkufh/media_my_nonunix_like_rust_os_safaos_now_has_a/)
+- [Introducing Ariel OS - an embedded library OS for small MCUs](https://www.reddit.com/r/rust/comments/1jo070l/introducing_ariel_os_an_embedded_library_os_for/)
+- [Stalloc: fast memory allocation on the stack](https://www.reddit.com/r/rust/comments/1jqjs6n/stalloc_fast_memory_allocation_on_the_stack/)
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 ## Infrastructure and Tooling
 
 In this section, we collect recent updates to `rustc`, `cargo`, and other tooling that are relevant to Rust OS development.
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+- [Allow `*const W<dyn A> -> *const dyn A` ptr cast](https://github.com/rust-lang/rust/pull/136127)
+- [Stabilize `asm_goto` feature gate](https://github.com/rust-lang/rust/pull/133870)
+
 ## `rust-osdev` Projects
 
 In this section, we give an overview of notable changes to the projects hosted under the [`rust-osdev`](https://github.com/rust-osdev/about) organization.