fix(iam/policy): change rule from list to set

[Codelax]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1361 (7ca8354) into master (bd1d718) will decrease coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1361      +/-   ##
==========================================
- Coverage   66.77%   66.67%   -0.11%     
==========================================
  Files         119      119              
  Lines       19143    19173      +30     
==========================================
  Hits        12783    12783              
- Misses       5256     5286      +30     
  Partials     1104     1104              

Impacted Files	Coverage Δ
scaleway/helpers_iam.go	0.00% <0.00%> (ø)
scaleway/resource_iam_policy.go	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bd1d718...7ca8354. Read the comment docs.