Fix Rive-runtime tests

# Description
Mac unit tests for the downstream rive-runtime have been failing for some time. Looks like glfw wasn't being built in the downstream workflow.

# Details
This PR adds the Build glfw step that we do in our mono repo into the rive-runtime test workflow. Ran it locally, was able to repro the test error and this fixes the issue locally.

```
../../../../renderer/path_fiddle/fiddle_context_gl.cpp:23:10: fatal error: 'GLFW/glfw3.h' file not found
hb-ot-map.cc
#include "GLFW/glfw3.h"
         ^~~~~~~~~~~~~~
```

Diffs=
92a4d0a287 Fix Rive-runtime tests (#9381)

Co-authored-by: Philip Chung <philterdesign@gmail.com>

.github/workflows/tests.yml

@@ -62,6 +62,10 @@ jobs:
           ./build.sh
           ./build.sh release
 
+      - name: Build glfw
+        working-directory: packages/runtime/skia/dependencies/
+        run: ./make_glfw.sh
+
       - name: Tests
         if: matrix.platform == 'macOS'
         run: |

.rive_head

@@ -1 +1 @@
-c4dcac323291c2ed9f26752f0d3fd2c0ef0e9a27
+92a4d0a287ad36dbb5bf4b0dc5ffbe2b43ff12ff