Downgrade geckodriver to v0.26

.github/scripts/build_assets/geckodriver-v0.26.0-win64/README.md

@@ -1 +1 @@
-This folder was taken from: https://github.com/mozilla/geckodriver/releases/tag/v0.27.0
+This folder was taken from: https://github.com/mozilla/geckodriver/releases/tag/v0.26.0

.github/workflows/build_icons.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Run icomoon_upload.py
         run: >
           python ./.github/scripts/icomoon_upload.py 
-          ./.github/scripts/build_assets/geckodriver-v0.27.0-win64/geckodriver.exe
+          ./.github/scripts/build_assets/geckodriver-v0.26.0-win64/geckodriver.exe
           ./icomoon.json ./devicon.json ./icons ./built_files --headless
       - name: Commit changes
         uses: stefanzweifel/git-auto-commit-action@v4