GitHub Actions Billing returns total_paid_minutes_used as float64

[raynigon]

Fixes#2283

GitHub Actions returns total_paid_minutes_used as floating point value.
The Implementation should accept this floating point value as float64.

Example

curl -H "Authorization: Bearer <TOKEN>" \
-H "Accept: application/vnd.github.v3+json" \
https://api.github.com/orgs/{org}/settings/billing/actions

{
"total_minutes_used": 1234,
"total_paid_minutes_used": 3959.0,
"included_minutes": 3000,
"minutes_used_breakdown": {
"UBUNTU": 1234,
"MACOS": 1234,
"WINDOWS": 1234
}
}

[codecov]

Codecov Report

Merging #2284 (757e1ce) into master (a842efc) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #2284 +/- ##
=======================================
Coverage 97.83% 97.83% =======================================
Files 115 115 Lines 10360 10360 =======================================
Hits 10136 10136 Misses 156 156 Partials 68 68 

Impacted Files	Coverage Δ
github/billing.go	100.00% <ø> (ø)

---

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[gmlewis]

Thank you, @raynigon !
LGTM.

Awaiting second LGTM/Approval from any other contributor to this repo before merging.

[gmlewis]

I'm driving several hundred miles today... I may be slow to respond.

[raynigon]

@Parker77 - do you have time to review this PR?

[Parker77]

LGTM!

[gmlewis]

Thank you, @Parker77 !
Merging.