Bump golang from 1.20.5 to 1.20.6 (#1300)

Bumps golang from 1.20.5 to 1.20.6.

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

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 --platform=${BUILDPLATFORM} golang:1.20.5 as toolchain
+FROM --platform=${BUILDPLATFORM} golang:1.20.6 as toolchain
 
 # Run this with docker build --build_arg $(go env GOPROXY) to override the goproxy
 ARG goproxy=https://proxy.golang.org,direct