Perform the check using runner.os

Author: henrymercer

.github/workflows/__export-file-baseline-information.yml

@@ -3,7 +3,7 @@ description: "Tests that file baseline information is exported when the feature
 versions: ["nightly-latest"]
 steps:
   - uses: swift-actions/setup-swift@5cdaa9161ad1f55ae39a5ea1784ef96de72f95d9
-    if: "!startsWith(matrix.os, 'windows')"
+    if: runner.os != 'Windows'
     with:
       swift-version: "5.7"
   - uses: ./../action/init

.github/workflows/__multi-language-autodetect.yml

@@ -5,7 +5,7 @@ env:
   CODEQL_ENABLE_EXPERIMENTAL_FEATURES_SWIFT: "true" # Remove when Swift is GA.
 steps:
   - uses: swift-actions/setup-swift@5cdaa9161ad1f55ae39a5ea1784ef96de72f95d9
-    if: "!startsWith(matrix.os, 'windows')"
+    if: runner.os != 'Windows'
     with:
       swift-version: "5.7"