Update badger/v2 dependency

Update github.com/dgraph-io/badger/v2 to v2.2007.3 which fixes the
protobuf namespace conflict.

Remove the protobuf build flag introduced in
0a98f04

Author: ed255

Diff for: Dockerfile

@@ -10,7 +10,7 @@ WORKDIR /src
 COPY . .
 RUN --mount=type=cache,sharing=locked,id=gomod,target=/go/pkg/mod/cache \
 	--mount=type=cache,sharing=locked,id=goroot,target=/root/.cache/go-build \
-	go build -trimpath -tags=badgerdb -o=. -ldflags="-w -s -X=go.vocdoni.io/dvote/internal.Version=$(git describe --always --tags --dirty --match='v[0-9]*') -X google.golang.org/protobuf/reflect/protoregistry.conflictPolicy=warn" -mod=readonly $BUILDARGS \
+	go build -trimpath -tags=badgerdb -o=. -ldflags="-w -s -X=go.vocdoni.io/dvote/internal.Version=$(git describe --always --tags --dirty --match='v[0-9]*')" -mod=readonly $BUILDARGS \
 	./cmd/dvotenode ./cmd/vochaintest
 
 FROM debian:10.10-slim AS test

Diff for: go.mod

@@ -16,6 +16,7 @@ require (
 	github.com/arnaucube/go-blindsecp256k1 v0.0.0-20210203222605-876755a714c3
 	github.com/cosmos/iavl v0.15.3
 	github.com/deroproject/graviton v0.0.0-20200906044921-89e9e09f9601
+	github.com/dgraph-io/badger/v2 v2.2007.3 // indirect
 	github.com/dgraph-io/badger/v3 v3.2011.1
 	github.com/ethereum/go-ethereum v1.9.26-0.20201212163632-00d10e610f9f
 	github.com/frankban/quicktest v1.13.0

Diff for: go.sum

@@ -247,6 +247,8 @@ github.com/dgraph-io/badger v1.6.2/go.mod h1:JW2yswe3V058sS0kZ2h/AXeDSqFjxnZcRrV
 github.com/dgraph-io/badger/v2 v2.2007.1/go.mod h1:26P/7fbL4kUZVEVKLAKXkBXKOydDmM2p1e+NhhnBCAE=
 github.com/dgraph-io/badger/v2 v2.2007.2 h1:EjjK0KqwaFMlPin1ajhP943VPENHJdEz1KLIegjaI3k=
 github.com/dgraph-io/badger/v2 v2.2007.2/go.mod h1:26P/7fbL4kUZVEVKLAKXkBXKOydDmM2p1e+NhhnBCAE=
+github.com/dgraph-io/badger/v2 v2.2007.3 h1:Sl9tQWz92WCbVSe8pj04Tkqlm2boW+KAxd+XSs58SQI=
+github.com/dgraph-io/badger/v2 v2.2007.3/go.mod h1:26P/7fbL4kUZVEVKLAKXkBXKOydDmM2p1e+NhhnBCAE=
 github.com/dgraph-io/badger/v3 v3.2011.1 h1:Hmyof0WMEF/QtutX5SQHzIMnJQxb/IrSzhjckV2SD6g=
 github.com/dgraph-io/badger/v3 v3.2011.1/go.mod h1:0rLLrQpKVQAL0or/lBLMQznhr6dWWX7h5AKnmnqx268=
 github.com/dgraph-io/ristretto v0.0.2/go.mod h1:KPxhHT9ZxKefz+PCeOGsrHpl1qZ7i70dGTu2u+Ahh6E=