build: bump golang base image version to 1.17

[tochicool]

Image fails to build on the current 1.16 tag with the error:

> docker build . --build-arg ARCH=amd64
...
btcd.go:21:2: //go:build comment without // +build comment
The command '/bin/sh -c set -ex   && if [ "${ARCH}" = "amd64" ]; then export GOARCH=amd64; fi   && if [ "${ARCH}" = "arm32v7" ]; then export GOARCH=arm; fi   && if [ "${ARCH}" = "arm64v8" ]; then export GOARCH=arm64; fi   && echo "Compiling for $GOARCH"   && go install -v . ./cmd/...' returned a non-zero code: 1

[coveralls]

Pull Request Test Coverage Report for Build 2984473967

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+16.7%) to 71.86%

---

Files with Coverage Reduction	New Missed Lines	%
btcutil/gcs/gcs.go	1	81.25%

Totals
Change from base Build 2836573928:	16.7%
Covered Lines:	12753
Relevant Lines:	17747

---

💛 - Coveralls

[jcvernaleo]

OK