Remove the tinyvec resolution constraint once 1.13.x builds

[leynos]

tinyvec 1.13.0 does not build on the nightly this repository pins. Its
src/tinyvec.rs imports alloc::vec as a module and then invokes the vec!
macro, so the macro no longer resolves:

error: cannot find macro `vec` in this scope
   --> tinyvec-1.13.0/src/tinyvec.rs:710:21
    |
710 |       TinyVec::Heap(vec![A::Item::default(); len])
    |                     ^^^
note: `vec` is imported here, but it is a module, not a macro
   --> tinyvec-1.13.0/src/tinyvec.rs:3:18
    |
  3 | use alloc::vec::{self, Vec};

tinyvec reaches this workspace transitively through Bevy's text and font
stack. This repository commits no Cargo.lock, so every build resolves the
newest compatible release and reaches the broken one. make lint and any
--all-features build fail on untouched main, reproduced on a clean
detached checkout with an isolated target directory.

The constraint tinyvec = "~1.12" in Cargo.toml holds resolution at 1.12
until this is fixed upstream. It is a resolution constraint only; no code in
this workspace names the crate.

Upstream: 1.13.0 was published 2026-09-03 at 21:13 UTC and is not yanked.
Lokathor/tinyvec#225 reports the same failure and Lokathor/tinyvec#226
proposes the fix.

Removal condition

Remove the tinyvec entry from Cargo.toml once a fixed release is published
and resolvable, or once 1.13.0 is yanked. Verify with make lint on a clean
checkout before removing.