build(deps): bump golang in /images/custom-scorecard-tests

Bumps golang from 1.16 to 1.17.2.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

images/custom-scorecard-tests/Dockerfile

@@ -1,5 +1,5 @@
 # Build the custom-scorecard-tests binary
-FROM --platform=$BUILDPLATFORM golang:1.16 as builder
+FROM --platform=$BUILDPLATFORM golang:1.17.0 as builder
 ARG TARGETARCH
 
 WORKDIR /workspace