Bump minimal version of protobuf to 3.12.2 (#8)

Set 3.12.2 as a minimum valid version (one used in alpine 3.12)

docker/Dockerfile

@@ -13,7 +13,7 @@ WORKDIR /home/wirepas
 
 # Protobuf checkout
 RUN git clone https://github.com/protocolbuffers/protobuf.git
-RUN cd protobuf && git checkout v3.12.0
+RUN cd protobuf && git checkout v3.12.2
 WORKDIR /home/wirepas/protobuf/python
 
 RUN export LD_LIBRARY_PATH=/usr/lib/
@@ -70,4 +70,4 @@ ENV PATH="/home/wirepas/.local/bin:${PATH}"
 # Copy the built wheel and its dependencies from builder
 COPY --from=builder /home/wirepas/.local /home/wirepas/.local
 
-LABEL com.wirepas.wmm.build.sha1="${WIREPAS_MESH_MESSAGING_BUIL_SHA1}"
+LABEL com.wirepas.wmm.build.sha1="${WIREPAS_MESH_MESSAGING_BUIL_SHA1}"

requirements.txt

@@ -1,3 +1,3 @@
-# 3.12 version is used as it is
+# 3.12.2 version is used as it is
 # the version available in alpine 3.12 (for protobuf cpp version)
-protobuf>=3.12.0,<4.0
+protobuf>=3.12.2,<4.0