Unpin flake8 and set action verion to v2

.github/workflows/codespell-private.yml

diff --git a/.github/workflows/codespell-private.yml b/.github/workflows/codespell-private.yml
index 5a566b4..6ca080a 100644
--- a/.github/workflows/codespell-private.yml
+++ b/.github/workflows/codespell-private.yml
@@ -56,6 +56,4 @@
     steps:
       - uses: actions/checkout@v2
       - name: Flake8 with annotations
-        uses: TrueBrain/actions-flake8@v2.1
-        with:
-          flake8_version: 3.9.2
+        uses: TrueBrain/actions-flake8@v2