chore(deps): permissive prometheus_exporter dependency

[vkrizan]

allowing to have versions 0.4 up to but not inluding 1.0 starting
with version 0.4.5.

[vkrizan]

@slemrmartin, @lindgrenj6, @syncrou, would you guys be able to have a look. (I was unable to set reviewers.) Thanks.

[vkrizan]

Hmm, there would be more changes to deps required to alleviate the version restrictions.

[dippy-bot]

Checked commit vkrizan@fd34b26 with ruby 2.5.7, rubocop 0.82.0, haml-lint 0.35.0, and yamllint
0 files checked, 0 offenses detected
Everything looks fine. 👍

[slemrmartin]

@vkrizan have you tried the gem with prometheus in app-interface, is higher version compatible?
Basically how it should influence version of this gem (patch/minor)?

[vkrizan]

@slemrmartin, we use prometheus_exporter 0.5.1 in Compliance in production. I can lock it up to 0.6.

[lindgrenj6]

Hey @vkrizan, thanks for the PR. Looking at this it basically locks us at 0.4.z, not up to 0.y.z.

If we want to lock it to basically anything pre-1.0 but greater than 0.4.5 we could lock like this: ~ 0.4, >= 0.4.5

[vkrizan]

@lindgrenj6 the suggestion looks good.

There were more of these that need to be updated in similar manor to allow us to consume the lib.