Change files encodings to UTF-8

[sfc-gh-knozderko]

Description

Change files encodings to UTF-8

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

Attention: Patch coverage is 87.25183% with 122 lines in your changes are missing coverage. Please review.

Project coverage is 84.66%. Comparing base (14cf8a5) to head (18f5c59).

Files	Patch %	Lines
Snowflake.Data/Core/Session/SFSession.cs	82.55%	58 Missing and 9 partials ⚠️
Snowflake.Data/Core/Session/SFSessionProperty.cs	83.73%	37 Missing and 3 partials ⚠️
Snowflake.Data/Core/HttpUtil.cs	95.41%	11 Missing and 4 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #927   +/-   ##
=======================================
  Coverage   84.66%   84.66%           
=======================================
  Files          89       89           
  Lines        9694     9694           
  Branches      919      919           
=======================================
  Hits         8207     8207           
  Misses       1259     1259           
  Partials      228      228           

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