Replace manual casts with new instanceof expression syntax

[ascopes]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.63636% with 5 lines in your changes missing coverage. Please review.

Project coverage is 87.16%. Comparing base (0dedcda) to head (e0717e9).
Report is 1 commits behind head on v5.

Files with missing lines	Patch %	Lines
.../jct/containers/impl/ModuleContainerGroupImpl.java	0.00%	2 Missing ⚠️
.../jct/workspaces/impl/AbstractManagedDirectory.java	0.00%	2 Missing ⚠️
...hub/ascopes/jct/workspaces/impl/WorkspaceImpl.java	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v5     #774      +/-   ##
==========================================
- Coverage   87.17%   87.16%   -0.01%     
==========================================
  Files          99       99              
  Lines        2932     2922      -10     
  Branches      229      230       +1     
==========================================
- Hits         2556     2547       -9     
+ Misses        329      328       -1     
  Partials       47       47              

Files with missing lines	Coverage Δ
.../containers/impl/ContainerGroupRepositoryImpl.java	59.68% <100.00%> (-0.92%)	⬇️
...ithub/ascopes/jct/filemanagers/ModuleLocation.java	100.00% <100.00%> (ø)
...opes/jct/filemanagers/impl/JctFileManagerImpl.java	100.00% <100.00%> (ø)
...opes/jct/filemanagers/impl/PathFileObjectImpl.java	100.00% <100.00%> (ø)
...b/ascopes/jct/junit/AbstractCompilersProvider.java	100.00% <100.00%> (ø)
.../io/github/ascopes/jct/utils/ModuleDiscoverer.java	100.00% <100.00%> (ø)
...a/io/github/ascopes/jct/utils/ToStringBuilder.java	100.00% <100.00%> (ø)
...pes/jct/workspaces/impl/WrappingDirectoryImpl.java	85.18% <100.00%> (ø)
...hub/ascopes/jct/workspaces/impl/WorkspaceImpl.java	39.77% <66.66%> (+0.44%)	⬆️
.../jct/containers/impl/ModuleContainerGroupImpl.java	22.22% <0.00%> (ø)
... and 1 more