feat: add support for returning posix path separator on windows (#2056)

Co-authored-by: GitHub Action <action@github.com>

src/changedFiles.ts

@@ -2,6 +2,7 @@ import * as core from '@actions/core'
 import * as github from '@actions/github'
 import type {RestEndpointMethodTypes} from '@octokit/rest'
 import flatten from 'lodash/flatten'
+import convertPath from '@stdlib/utils-convert-path'
 import mm from 'micromatch'
 import * as path from 'path'
 import {setOutputsAndGetModifiedAndChangedFilesStatus} from './changedFilesOutput'
@@ -355,7 +356,11 @@ function* getChangeTypeFilesGenerator({
       filePaths,
       dirNamesIncludeFilePatterns
     })) {
-      yield filePath
+      if (isWindows() && inputs.usePosixPathSeparator) {
+        yield convertPath(filePath, 'mixed')
+      } else {
+        yield filePath
+      }
     }
   }
 }
@@ -402,7 +407,11 @@ function* getAllChangeTypeFilesGenerator({
     filePaths,
     dirNamesIncludeFilePatterns
   })) {
-    yield filePath
+    if (isWindows() && inputs.usePosixPathSeparator) {
+      yield convertPath(filePath, 'mixed')
+    } else {
+      yield filePath
+    }
   }
 }