CI: Unify the `GITHUB_TOKEN` name across matrix.py and vtest.yml

This makes naming a little clearer in matrix.py, because the name matches the
name of the actual secret.

.github/matrix.py

@@ -29,8 +29,8 @@ def clean_ssl(ssl):
 @functools.lru_cache(5)
 def determine_latest_openssl(ssl):
     headers = {}
-    if environ.get('GITHUB_API_TOKEN'):
-        headers["Authorization"] = "token {}".format(environ.get('GITHUB_API_TOKEN'))
+    if environ.get('GITHUB_TOKEN'):
+        headers["Authorization"] = "token {}".format(environ.get('GITHUB_TOKEN'))
 
     request = urllib.request.Request('https://api.github.com/repos/openssl/openssl/tags', headers=headers)
     openssl_tags = urllib.request.urlopen(request)

.github/workflows/vtest.yml

@@ -26,7 +26,7 @@ jobs:
       - uses: actions/checkout@v3
       - name: Generate Build Matrix
         env:
-          GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         id: set-matrix
         run: python3 .github/matrix.py "${{ github.ref_name }}"