fetch tags before building circuitpython

Author: jepler

.github/workflows/build.yml

@@ -55,7 +55,7 @@ jobs:
     - name: Clone and build circuitpython unix port
       run: |
         set -e
-        [ -e circuitpython/py/py.mk ] || git clone --depth=1 https://github.com/adafruit/circuitpython
+        [ -e circuitpython/py/py.mk ] || (git clone --depth=1 https://github.com/adafruit/circuitpython && cd circuitpython && git fetch --tags --recurse-submodules=no --shallow-since="2021-07-01" https://github.com/adafruit/circuitpython HEAD)
         [ -e circuitpython/lib/libffi/autogen.sh ] || (cd circuitpython && git submodule update --init lib/libffi lib/axtls lib/berkeley-db-1.xx tools/huffman lib/uzlib extmod/ulab)
         [ -x circuitpython/ports/unix/micropython ] || (
             make -C circuitpython/mpy-cross -j$(nproc)