Tests currently broken on Windows (due to difference in file paths)

[NHDaly]

https://github.com/NHDaly/SnapshotTesting.jl/runs/7491708728?check_suite_focus=true
https://github.com/NHDaly/SnapshotTesting.jl/runs/7491772253?check_suite_focus=true

[NHDaly]

Testing Running tests...
test1: Test Failed at D:\a\SnapshotTesting.jl\SnapshotTesting.jl\src\snapshots.jl:55
  Expression: subpath in new_files
   Evaluated: "\\a" in Set(["a"])
Stacktrace:
 [1] macro expansion
   @ C:\hostedtoolcache\windows\julia\1.7.3\x64\share\julia\stdlib\v1.7\Test\src\Test.jl:[44](https://github.com/NHDaly/SnapshotTesting.jl/runs/7491708728?check_suite_focus=true#step:6:47)5 [inlined]
 [2] _recursive_diff_dirs(expected_dir::String, new_dir::String; allow_additions::Bool)
   @ SnapshotTestingD:\a\SnapshotTesting.jl\SnapshotTesting.jl\src\snapshots.jl:55
┌ Error: New snapshot is missing file `\a`. Expected contents:
│   expected_content = "hello"
└ @ SnapshotTesting D:\a\SnapshotTesting.jl\SnapshotTesting.jl\src\snapshots.jl:57
┌ Error: New snapshot is missing file `\a`. Expected contents:
│   expected_content = "hello"
└ @ SnapshotTesting D:\a\SnapshotTesting.jl\SnapshotTesting.jl\src\snapshots.jl:57
┌ Error: New snapshot contains unexpected files. If this is not an error in your
│                 case, pass `allow_additions = true`.
└ @ SnapshotTesting D:\a\SnapshotTesting.jl\SnapshotTesting.jl\src\snapshots.jl:76
┌ Error: File: `a` contents:
│   new_content = "this file is different"
└ @ SnapshotTesting D:\a\SnapshotTesting.jl\SnapshotTesting.jl\src\snapshots.jl:83