Bump golang.org/x/net from 0.34.0 to 0.38.0 in /lib #298

Job	Run time
test (TestSmoke, Geth, ws://localhost:8546, -race)	2m 6s
test (TestSmoke, Anvil, http://localhost:8545, -race)	1m 38s
test (TestAPI, Geth, ws://localhost:8546, -race)	2m 35s
test (TestAPI, Anvil, http://localhost:8545, -race)	1m 50s
test (TestTrace, Geth, ws://localhost:8546, -race)	3m 38s
test (TestTrace, Anvil, http://localhost:8545, -race)	1m 37s
test (TestCLI, Geth, ws://localhost:8546, -race)	1m 49s
test (TestCLI, Anvil, http://localhost:8545, -race)	1m 59s
test ('TestConfig', Geth, ws://localhost:8546, '')	3m 40s
test ('TestConfig', Anvil, http://localhost:8545, '')	3m 14s
test ('TestContractMap\|TestGasEstimator\|TestRPCHealthCheck\|TestUtil\|TestContract', Geth, ws://loc...	2m 18s
test ('TestContractMap\|TestGasEstimator\|TestRPCHealthCheck\|TestUtil\|TestContract', Anvil, http://...	1m 55s
	28m 19s

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