Adding lowercase "graphql" to deck breaks parsing

To reproduce just add the lowercased word “graphql” anywhere to your deck and start with mdx-deck deck.mdx

This is the error message printed

 ERROR #85911  GRAPHQL

There was a problem parsing "/home/alfiehub/decks/deck.mdx"; any GraphQL
fragments or queries in this file were not processed.

This may indicate a syntax error in the code, or it may be a file type
that Gatsby does not know how to parse.

File: ../../deck.mdx

[dylanirlbeck]

Can confirm this is still an issue. Dang this was annoying.

[ProchaLu]

I got the same error when creating a slide deck. After some digging, I found that the problem was in the file node-mdules/gatsby/dist/query/file-parser.js

https://github.com/gatsbyjs/gatsby/blob/61f197d2c6deda2d45ba185df190301bb8219676/packages/gatsby/src/query/file-parser.js#L509-L517

After changing the if block the error went away and the slides were created.

  if (
-      !text.includes(`graphql`) &&
-      !text.includes(`gatsby-plugin-image`) &&
-      !text.includes(`getServerData`) &&
-      !text.includes(`config`) &&
-      !text.includes(`Slice`)
+      file.endsWith('.mdx') ||
+      (!text.includes(`graphql`) &&
+        !text.includes(`gatsby-plugin-image`) &&
+        !text.includes(`getServerData`) &&
+        !text.includes(`config`) &&
+.       !text.includes(`Slice`))
    ) {
      return null;
    }