Update github.com/brave-intl/bat-go/libs digest to 2e8f6a4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/brave-intl/bat-go/libs	require	digest	cc9860c -> 2e8f6a4

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[renovate[bot]]

ℹ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 1 additional dependency was updated

Details:

Package	Change
golang.org/x/crypto	v0.19.0 -> v0.21.0