fix(CI): Switch to the latest Nimble

.github/workflows/ci.yml

@@ -153,7 +153,9 @@ jobs:
       - name: Build Nim and Nimble
         run: |
           curl -O -L -s -S https://raw.githubusercontent.com/status-im/nimbus-build-system/master/scripts/build_nim.sh
-          env MAKE="${MAKE_CMD} -j${ncpu}" ARCH_OVERRIDE=${PLATFORM} NIM_COMMIT=${{ matrix.branch }} \
+          env MAKE="${MAKE_CMD} -j${ncpu}" ARCH_OVERRIDE=${PLATFORM} \
+            NIM_COMMIT=${{ matrix.branch }} \
+            NIMBLE_COMMIT=a4fc798838ee753f5485dd19afab22e9367eb0e7 \
             QUICK_AND_DIRTY_COMPILER=1 QUICK_AND_DIRTY_NIMBLE=1 CC=gcc \
             bash build_nim.sh nim csources dist/nimble NimBinaries
           echo '${{ github.workspace }}/nim/bin' >> $GITHUB_PATH