Bump golang from 6fbd2d3 to 5f5d61d in /tests (#2437)

Bumps golang from `6fbd2d3` to `5f5d61d`.

---
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>

tests/Dockerfile

@@ -1,5 +1,5 @@
 # The Dockerfile's resulting image is purpose-built for executing Jaeger Operator e2e tests within the OpenShift release (https://github.com/openshift/release) using Prow CI.
-FROM golang@sha256:6fbd2d3398db924f8d708cf6e94bd3a436bb468195daa6a96e80504e0a9615f2
+FROM golang@sha256:5f5d61dcb58900bc57b230431b6367c900f9982b583adcabf9fa93fd0aa5544a
 
 # Set the user to root
 USER root