workflows: use actions/cache@v2

.github/workflows/build.yml

@@ -462,7 +462,7 @@ jobs:
     - run: git fetch --recurse-submodules=no https://github.com/adafruit/circuitpython refs/tags/*:refs/tags/*
     - name: CircuitPython version
       run: git describe --dirty --tags
-    - uses: actions/cache@v1
+    - uses: actions/cache@v2
       name: Fetch IDF tool cache
       id: idf-cache
       with:

.github/workflows/pre-commit.yml

@@ -21,7 +21,7 @@ jobs:
       run: git submodule update --init extmod/ulab
     - name: set PY
       run: echo >>$GITHUB_ENV PY="$(python -c 'import hashlib, sys;print(hashlib.sha256(sys.version.encode()+sys.executable.encode()).hexdigest())')"
-    - uses: actions/cache@v1
+    - uses: actions/cache@v2
       with:
         path: ~/.cache/pre-commit
         key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}