Bump golang from 1.19.6 to 1.20.2 (#1156)

Bumps golang from 1.19.6 to 1.20.2.

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

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

Author: dependabot[bot]

Dockerfile

@@ -15,7 +15,7 @@
 # limitations under the License.
 
 # Build the manager binary
-FROM golang:1.19.6 as builder
+FROM golang:1.20.2 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests