upgrade LF action (#315)

Author: jmckenna

.github/workflows/check-crlf.yml

@@ -8,13 +8,13 @@ on: [push, pull_request]
 jobs:
   Check-CRLF:
     name: verify that only LF linefeeds are used
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
 
     steps:
       - name: Checkout repository contents
-        uses: actions/checkout@v1
+        uses: actions/checkout@v3
 
       - name: Use action to check for CRLF endings
-        uses: erclu/check-crlf@v1.1.2
+        uses: erclu/check-crlf@v1.2.0
         with: # ignore directories below, space-delimited
           exclude: