Fix problem with TempDir failing when using a custom class...

[leonard84]

that extends from File or Path

fixes #1518

[codecov]

Codecov Report

Merging #1519 (0a7de01) into master (7f5e1ec) will increase coverage by 79.80%.
The diff coverage is 50.00%.

@@              Coverage Diff              @@
##             master    #1519       +/-   ##
=============================================
+ Coverage          0   79.80%   +79.80%     
- Complexity        0     4052     +4052     
=============================================
  Files             0      412      +412     
  Lines             0    12795    +12795     
  Branches          0     1655     +1655     
=============================================
+ Hits              0    10211    +10211     
- Misses            0     1985     +1985     
- Partials          0      599      +599     

Impacted Files	Coverage Δ
...rk/runtime/extension/builtin/TempDirExtension.java	86.95% <50.00%> (ø)
...rc/main/java/org/spockframework/lang/Wildcard.java	80.00% <0.00%> (ø)
...ava/org/spockframework/compiler/SpecAnnotator.java	99.06% <0.00%> (ø)
...work/runtime/extension/builtin/RetryExtension.java	93.33% <0.00%> (ø)
.../runtime/extension/builtin/TempDirInterceptor.java	95.65% <0.00%> (ø)
.../main/java/org/spockframework/mock/MockNature.java	100.00% <0.00%> (ø)
...org/spockframework/compiler/model/ExpectBlock.java	100.00% <0.00%> (ø)
...spockframework/mock/CannotCreateMockException.java	66.66% <0.00%> (ø)
...kframework/runtime/extension/MethodInvocation.java	80.76% <0.00%> (ø)
... and 403 more

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