Bump golang from 1.19-alpine to 1.20-alpine (#287)

Bumps golang from 1.19-alpine to 1.20-alpine.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19-alpine as builder
+FROM golang:1.20-alpine as builder
 
 WORKDIR /app
 COPY go.* .