Merge pull request #178858 from Homebrew/ca-certificates-fix-file-exist-check

ca-certificates: Add missing () to make `exist?` work on a Pathname

Author: issyl0

Formula/c/ca-certificates.rb

@@ -121,7 +121,7 @@ def macos_post_install
   end
 
   def linux_post_install
-    rm(pkgetc/"cert.pem") if pkgetc/"cert.pem".exist?
+    rm(pkgetc/"cert.pem") if (pkgetc/"cert.pem").exist?
     pkgetc.mkpath
     cp pkgshare/"cacert.pem", pkgetc/"cert.pem"
   end