Update kotlin from 1.4.32 to 1.5

[petertrr]

What's done:

• Updated kotlin
• Enabled snapshot jacoco
• Updated settings in diktat configs
• Updated gradle to 6.9

TODO:

• remove explicit compiler flag for IR, since it's default now
• use fixed version of jacoco snapshot (?) Update jacoco to 0.8.7, it's already out

[codecov]

Codecov Report

Merging #856 (0dd2012) into master (de04b9b) will increase coverage by 0.43%.
The diff coverage is 90.90%.

@@             Coverage Diff              @@
##             master     #856      +/-   ##
============================================
+ Coverage     83.51%   83.94%   +0.43%     
- Complexity     2215     2308      +93     
============================================
  Files           101      100       -1     
  Lines          5689     5893     +204     
  Branches       1628     1739     +111     
============================================
+ Hits           4751     4947     +196     
- Misses          256      261       +5     
- Partials        682      685       +3     

Flag	Coverage Δ	Complexity Δ
unittests	83.94% <90.90%> (+0.43%)	2308.00 <1.00> (+93.00)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...fn/diktat/common/config/rules/RulesConfigReader.kt	35.29% <0.00%> (ø)	3.00 <0.00> (-1.00)
.../diktat/ruleset/rules/chapter1/IdentifierNaming.kt	84.14% <100.00%> (-0.04%)	90.00 <1.00> (+3.00)	⬇️
...at/ruleset/rules/chapter3/files/IndentationRule.kt	85.91% <100.00%> (+1.35%)	46.00 <0.00> (+1.00)
...diktat/ruleset/rules/chapter6/AvoidUtilityClass.kt	77.27% <100.00%> (ø)	16.00 <0.00> (+1.00)
...tlin/org/cqfn/diktat/ruleset/utils/AstNodeUtils.kt	85.54% <100.00%> (+0.76%)	0.00 <0.00> (ø)
...n/org/cqfn/diktat/ruleset/utils/StringCaseUtils.kt	86.07% <100.00%> (+0.36%)	0.00 <0.00> (ø)
...otlin/org/cqfn/diktat/ruleset/utils/StringUtils.kt	91.17% <100.00%> (ø)	0.00 <0.00> (ø)
...n/kotlin/org/cqfn/diktat/ruleset/utils/PsiUtils.kt	50.00% <0.00%> (-10.00%)	0.00% <0.00%> (ø%)
.../cqfn/diktat/ruleset/rules/chapter5/CustomLabel.kt	84.61% <0.00%> (-7.70%)	10.00% <0.00%> (ø%)
...kotlin/org/cqfn/diktat/ruleset/rules/DiktatRule.kt	70.58% <0.00%> (-5.89%)	8.00% <0.00%> (+1.00%)	⬇️
... and 66 more

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