use nanopb 0.4.7

.github/workflows/update_protobufs.yml

@@ -17,9 +17,9 @@ jobs:
 
       - name: Download nanopb
         run: |
-          wget https://jpa.kapsi.fi/nanopb/download/nanopb-0.4.6-linux-x86.tar.gz
-          tar xvzf nanopb-0.4.6-linux-x86.tar.gz
-          mv nanopb-0.4.6-linux-x86 nanopb-0.4.6
+          wget https://jpa.kapsi.fi/nanopb/download/nanopb-0.4.7-linux-x86.tar.gz
+          tar xvzf nanopb-0.4.7-linux-x86.tar.gz
+          mv nanopb-0.4.7-linux-x86 nanopb-0.4.7
 
       - name: Re-generate protocol buffers
         run: |