ci: disable wasmtime build

Problem: The wasmtime version compatible with tree-sitter 0.25.x fails
current Rust lint.

Solution: Disable wasmtime build.

Rationale:
1. As the only Rust dependency, these force us into a fast-moving update cycle (new warnings for everyone!);
2. wasmtime has a monthly release cycle, but we're locked into whatever tree-sitter supports, and there's no clear compatibility matrix (and I no longer care enough to spend the time and effort keeping this synced between tree-sitter and neovim);
3. we only test building with wasmtime but not actually using wasm parsers (this was actually broken for a while without being caught);
4. we're probably not going to go with wasmtime as our default wasm engine anyway.

.github/workflows/build.yml

@@ -21,21 +21,6 @@ env:
   INSTALL_PREFIX: ${{ github.workspace }}/nvim-install
 
 jobs:
-  wasmtime:
-    strategy:
-      fail-fast: false
-      matrix:
-        test: [ubuntu-latest, macos-latest, windows-latest]
-    runs-on: ${{ matrix.test }}
-    steps:
-      - uses: actions/checkout@v5
-      - uses: ./.github/actions/setup
-      - run: |
-          cmake -S cmake.deps --preset ci -D ENABLE_WASMTIME=ON
-          cmake --build .deps
-          cmake --preset ci -D ENABLE_WASMTIME=ON
-          cmake --build build
-
   old-cmake:
     name: Test oldest supported cmake
     runs-on: ubuntu-latest