chore(deps): update mergo

[GGabriele]

This makes us able to set zero-value fields and not have them overwritten from non-zero value defaults.

Before:

$ cat kong.yaml
upstreams:
- name: upstream1
  algorithm: round-robin
  targets:
  - target: 198.51.100.11:80
    weight: 0  # default being 100

$ deck sync
<--omitted-->

$ http :8001/upstreams/upstream1/targets | jq ".data[0].weight"
100

After:

$ deck sync
<--omitted-->

$ http :8001/upstreams/upstream1/targets | jq ".data[0].weight"
0

[hbagdi]

Umm, based on the PR description, it seems that we won't be able to set target's weight to 0.
Is that intended?

From what I understand, we want to give the user the ability to specify a zero value.

[GGabriele]

Umm, based on the PR description, it seems that we won't be able to set target's weight to 0. Is that intended?

I included this snipped in the After section, which shows how we can now set zero-values:

$ deck sync
<--omitted-->

$ http :8001/upstreams/upstream1/targets | jq ".data[0].weight"
0

Sorry if that wasn't clear

[hbagdi]

Sorry, my bad.
Can we include an end to end test using our shiny new testing framework?

[GGabriele]

Can we include an end to end test using our shiny new testing framework?

Just added this in the other PR about integrations tests.

That one is currently failing, but it will pass once we merge this PR.