fix(rust): relax Python build dependency to allow up to 3.15

Previous cap of <3.12 was overly restrictive. Rust's build system
supports newer Python versions. Widen range to <3.15 to allow
building with current Python releases.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: timothytlewis

projects/rust-lang.org/package.yml

@@ -40,7 +40,7 @@ build:
   dependencies:
     cmake.org: ^3.20
     ninja-build.org: ^1.10
-    python.org: '>=3<3.12'
+    python.org: '>=3<3.15'
     openssl.org: '*' # needed to build openssl-sys
     crates.io/semverator: 0
     linux: