bump min PL to 1.7

[Borda]

What does this PR do?

Setting min PL version to 1.7 to narrow the installation range

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[codecov]

Codecov Report

Merging #1596 (d662d45) into master (02157ae) will decrease coverage by 4%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #1596    +/-   ##
=======================================
- Coverage      86%     82%    -4%     
=======================================
  Files         291     291            
  Lines       12874   12874            
=======================================
- Hits        11017   10533   -484     
- Misses       1857    2341   +484