chore(deps): bump golang from 1.19 to 1.20 in /.github/go

Bumps golang from 1.19 to 1.20.

---
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]

.github/go/Dockerfile

@@ -1 +1 @@
-FROM golang:1.19
+FROM golang:1.20