chore: golang version consolidation

[SgtPooki]

the golang version used for the docker container (1.17.8) is different than the golang version in the go.mod file (1.16).

ipfs-check/go.mod

Line 3 in 83979b0

go 1.16

vs

ipfs-check/Dockerfile

Line 1 in 83979b0

FROM cimg/go:1.17.8

[aschmahmann]

It's fine to update the go.mod version, but it's ok for them to not be the same. go.mod's Go version is basically the minimum Go "semantics" to use so you need to compile with Go >= the version in the go.mod file