Remove aws_iam_policy_attachment resources from strict mode

[sundowndev]

Q	A
🐛 Bug fix?	yes
🚀 New feature?	no
⚠ Deprecations?	no
❌ BC Break	no
🔗 Related issues	#489
❓ Documentation	yes

Description

Manually adding an IAM policy on an IAM user was detected as a drift until 0.7.0 but 0.7.1 did not (regression)

[codecov]

Codecov Report

Merging #498 (c76702b) into v0.8 (717ffae) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             v0.8     #498      +/-   ##
==========================================
- Coverage   70.96%   70.90%   -0.07%     
==========================================
  Files         289      289              
  Lines        6562     6548      -14     
==========================================
- Hits         4657     4643      -14     
  Misses       1525     1525              
  Partials      380      380              

Impacted Files	Coverage Δ
pkg/middlewares/aws_defaults.go	100.00% <ø> (ø)