ci: fix zig setup to match fff.nvim

mlugg/setup-zig@v1 resolved zig 0.16.0 from the wrong location and 404'd
on every mirror. Pin mlugg/setup-zig@v2 with version 0.16.0 and install
cargo-zigbuild via cargo install, matching fff.nvim's working setup. Also
set MACOSX_DEPLOYMENT_TARGET=13 on the macOS build for wider compat.

Author: willothy

.github/workflows/release.yml

@@ -59,19 +59,21 @@ jobs:
 
       - name: Install zig
         if: matrix.builder == 'zigbuild'
-        uses: mlugg/setup-zig@v1
+        uses: mlugg/setup-zig@v2
+        with:
+          version: 0.16.0
       - name: Install cargo-zigbuild
         if: matrix.builder == 'zigbuild'
-        uses: taiki-e/install-action@v2
-        with:
-          tool: cargo-zigbuild
+        run: cargo install cargo-zigbuild
 
       - name: Build (zigbuild)
         if: matrix.builder == 'zigbuild'
         run: cargo zigbuild --release --target ${{ matrix.target }}
       - name: Build (cargo)
         if: matrix.builder == 'cargo'
         run: cargo build --release --target ${{ matrix.target }}
+        env:
+          MACOSX_DEPLOYMENT_TARGET: "13"
 
       # Ad-hoc sign so macOS does not block the downloaded dylib.
       - name: Codesign (macOS)