Bump github.com/ethereum/go-ethereum from 1.12.1 to 1.13.15

Bumps [github.com/ethereum/go-ethereum](https://github.com/ethereum/go-ethereum) from 1.12.1 to 1.13.15.
- [Release notes](https://github.com/ethereum/go-ethereum/releases)
- [Commits](ethereum/go-ethereum@v1.12.1...v1.13.15)

---
updated-dependencies:
- dependency-name: github.com/ethereum/go-ethereum
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -4,18 +4,19 @@ go 1.17
 
 require (
 	github.com/dchest/uniuri v1.2.0
-	github.com/ethereum/go-ethereum v1.12.1
+	github.com/ethereum/go-ethereum v1.13.15
 	github.com/relvacode/iso8601 v1.1.1-0.20210511065120-b30b151cc433
-	github.com/stretchr/testify v1.8.1
+	github.com/stretchr/testify v1.8.4
 )
 
 require (
 	github.com/btcsuite/btcd/btcec/v2 v2.3.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.1.0 // indirect
-	github.com/holiman/uint256 v1.2.3 // indirect
+	github.com/holiman/uint256 v1.2.4 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/crypto v0.17.0 // indirect
-	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/sys v0.16.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )