[UPDATE] minor version bump for checkmake

Changes in file .github/workflows/makefile-lint.yml:
 * bump checkmake

Author: reactive-firewall

.github/workflows/makefile-lint.yml

@@ -66,7 +66,7 @@ jobs:
         run: |
           git clone --depth 1 --branch main https://github.com/mrtazz/checkmake.git checkmake
           cd checkmake
-          EXPECTED_SHA="e11578c51935b2d95ecc1bee292b6a5aa93ae054" # v0.2.2+20
+          EXPECTED_SHA="880668e0015d47e9b84ec5edfec4bf67b4228ea4" # v0.2.2+21
           ACTUAL_SHA=$(git rev-parse HEAD)
           if [ "$EXPECTED_SHA" != "$ACTUAL_SHA" ]; then
             ERR_MSG_STUB="Checkmake repository hash verification failed."