Bump golang from 1.19 to 1.20 (#294)

* Bump golang from 1.19 to 1.20

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] <support@github.com>

* Go mod

---------

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19 as builder
+FROM golang:1.20 as builder
 
 WORKDIR /build
 

go.mod

@@ -1,6 +1,6 @@
 module github.com/bakito/k8s-event-logger-operator
 
-go 1.19
+go 1.20
 
 require (
 	github.com/bakito/operator-utils v1.3.2