fix(*): remove more global config ref

[windmgc]

A followup of #83

[github-actions]

Luacheck Report

1 tests   - 14   1 ✔️ +  1   0s ⏱️ ±0s
1 suites ±  0   0 💤 ±  0 
1 files   ±  0   0 ❌  - 15 

Results for commit 1bf5ada. ± Comparison against base commit 0664553.

This pull request removes 15 and adds 1 tests. Note that renamed tests count towards both.

src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:1
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:10
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:2
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:3
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:4
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:5
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:6
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:7
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:8
src/resty/aws/credentials/CredentialProviderChain.lua ‑ src/resty/aws/credentials/CredentialProviderChain.lua:9
…

src/resty/aws/credentials/TokenFileWebIdentityCredentials.lua ‑ src/resty/aws/credentials/TokenFileWebIdentityCredentials.lua