Fix FindEndOfLifeImagesTest to suggest Node 26 or 24

[greg-at-moderne]

What's changed?

Changing the test expectations in FindEndOfLifeImagesTest to mention Node 26.

What's your motivation?

Fix broken CI after a77f82c:

org.opentest4j.AssertionFailedError: [Unexpected result in "Dockerfile": |  
-- | --
diff --git a/Dockerfile b/Dockerfile |  
index ec10687..8d11f45 100644 |  
--- a/Dockerfile |  
+++ b/Dockerfile |  
@@ -1,2 +1,2 @@ |  
-~~(EOL: node:14-slim (ended 2023-04-30, suggest 24 or 22))~~>FROM node:14-slim |  
+~~(EOL: node:14-slim (ended 2023-04-30, suggest 26 or 24))~~>FROM node:14-slim |  
RUN npm install |  
\ No newline at end of file |  
]