mass replace "flip map -> foreach"

See `foreach`-introduction commit.
```
rg 'flip map ' --files-with-matches | xargs sed -i 's/flip map /foreach /g'
```

pkgs/applications/networking/remote/citrix-receiver/default.nix

@@ -58,7 +58,7 @@ let
       versions = [ "13.8.0" "13.9.0" "13.9.1" ];
     in
       lib.listToAttrs
-        (lib.flip map versions
+        (lib.foreach versions
           (v: lib.nameValuePair v (throw "Unsupported citrix_receiver version: ${v}")));
   in
     deprecatedVersions // supportedVersions;

pkgs/applications/networking/remote/citrix-workspace/default.nix

@@ -59,7 +59,7 @@ let
       versions = [ ];
     in
       lib.listToAttrs
-        (lib.flip map versions
+        (lib.foreach versions
           (v: lib.nameValuePair v (throw "Unsupported citrix_workspace version: ${v}")));
   in
     deprecatedVersions // supportedVersions;