Update go-ethereum version to v1.10.8

This is a result of updating go-ethereum version to the latest v1.10.8.

```
➜  keep-common git:(main) ✗ go get github.com/ethereum/go-ethereum
go get: upgraded github.com/ethereum/go-ethereum v1.10.1 => v1.10.8
go get: upgraded github.com/olekukonko/tablewriter v0.0.2 => v0.0.5
go get: upgraded golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 => v0.0.0-20210322153248-0c34fe9e7dc2
go get: upgraded golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 => v0.0.0-20210220032951-036812b2e83c
go get: upgraded golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 => v0.0.0-20210220033141-f8bda1e9f3ba
go get: upgraded golang.org/x/tools v0.0.0-20200117012304-6edc0a871e69 => v0.1.0
```

Author: nkuba

go.mod

@@ -9,21 +9,21 @@ require (
 	github.com/aristanetworks/goarista v0.0.0-20190924011532-60b7b74727fd // indirect
 	github.com/celo-org/celo-blockchain v0.0.0-20210222234634-f8c8f6744526
 	github.com/cespare/cp v1.1.1 // indirect
+	github.com/consensys/gurvy v0.3.8 // indirect
 	github.com/deckarep/golang-set v1.7.1 // indirect
-	github.com/ethereum/go-ethereum v1.10.1
+	github.com/ethereum/go-ethereum v1.10.8
 	github.com/gballet/go-libpcsclite v0.0.0-20191108122812-4678299bea08 // indirect
 	github.com/ipfs/go-log v0.0.1
 	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
 	github.com/karalabe/usb v0.0.0-20191104083709-911d15fe12a9 // indirect
-	github.com/olekukonko/tablewriter v0.0.2 // indirect
 	github.com/pborman/uuid v1.2.0 // indirect
 	github.com/prometheus/tsdb v0.10.0 // indirect
 	github.com/rjeczalik/notify v0.9.2 // indirect
 	github.com/status-im/keycard-go v0.0.0-20191119114148-6dd40a46baa0 // indirect
 	github.com/tyler-smith/go-bip39 v1.0.2 // indirect
 	github.com/urfave/cli v1.22.1
-	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
-	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
-	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
-	golang.org/x/tools v0.0.0-20200117012304-6edc0a871e69
+	golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba
+	golang.org/x/tools v0.1.0
 )