Unreliable crash when using filesystem plugin with path

[SHA65536]

Description

When using 2ms filesystem --path somedir/ on a non empty dir, sometimes there's a crash (possible data-race).

Steps to reproduce

1. Create a directory mkdir testdir
2. Create a file in the dir echo "someinfo" > testdir/testfile.txt
3. Run 2ms filesystem --path testdir

Expected Behavior

Expecting the command to succeed and report no secrets.

Current Behavior

Sometimes ( around 1 / 3 times ) the program panics with this error stack:

panic: sync: WaitGroup is reused before previous Wait has returned

goroutine 1 [running]:
sync.(*WaitGroup).Wait(0x0?)
	/usr/local/go/src/sync/waitgroup.go:118 +0x7f
github.com/checkmarx/2ms/cmd.postRun(0xc00012a600?, {0xa79f14?, 0x2?, 0x2?})
	/home/<redacted>/Downloads/2ms/cmd/main.go:171 +0x3a
github.com/spf13/cobra.(*Command).execute(0xc00012a600, {0xc0001242c0, 0x2, 0x2})
	/home/<redacted>/go/pkg/mod/github.com/spf13/[email protected]/command.go:936 +0xa2b
github.com/spf13/cobra.(*Command).ExecuteC(0xef3ce0)
	/home/<redacted>/go/pkg/mod/github.com/spf13/[email protected]/command.go:1044 +0x3bd
github.com/spf13/cobra.(*Command).Execute(...)
	/home/<redacted>/go/pkg/mod/github.com/spf13/[email protected]/command.go:968
github.com/checkmarx/2ms/cmd.Execute()
	/home/<redacted>/Downloads/2ms/cmd/main.go:107 +0x5e5
main.main()
	/home/<redacted>/Downloads/2ms/main.go:22 +0x1fa
exit status 2

I removed my information from the stack trace and replaced with