build: Update to gcc10 preview

Author: jepler

.github/workflows/build.yml

@@ -341,8 +341,8 @@ jobs:
       run: |
         sudo apt-get install -y gettext
         pip install requests sh click setuptools awscli
-        wget https://adafruit-circuit-python.s3.amazonaws.com/gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2
-        sudo tar -C /usr --strip-components=1 -xaf gcc-arm-none-eabi-9-2019-q4-major-x86_64-linux.tar.bz2
+        wget --no-verbose https://developer.arm.com/-/media/Files/downloads/gnu-rm/10-2020q2/gcc-arm-none-eabi-10-2020-q2-preview-x86_64-linux.tar.bz2
+        sudo tar -C /usr --strip-components=1 -xaf gcc-arm-none-eabi-10-2020-q2-preview-x86_64-linux.tar.bz2
     - name: Versions
       run: |
         gcc --version