Expect test fialure for myers-diff

Error on LTS build is:

```
       Error: [S-1995]
       Test suite failure for package myers-diff-0.3.0.2
           myers-diff-test:  executable not found
       Full log available at /home/curators/work/unpack-dir/.stack-work/logs/myers-diff-0.3.0.2-test.log

           Beginning suite of 22 tests

           Run root: /home/curators/work/unpack-dir/unpacked/myers-diff-0.3.0.2-4f60b4772b6e65e0cd0e081c426a3448cacba01da7369d48c99bd92192e6dff4/test_runs/2025-08-26T18_58_51.208709665Z

             VectorMyers
                 Single deletes
                     "a" -> ""
                     "ab" -> "a"
                     "ab" -> "b"
                     "\na" -> "\n"
                     "\n\na" -> "\n\n"
                 Single inserts
                     "" -> "a"
                     "\n" -> "a\n"
                     "\n" -> "\na"
                 Double deletes
                     "ab" -> ""
                     "xab" -> "x"
                     "xab" -> "x" (consolidated)
                     "abc" -> "b"
                 Double inserts
                     "" -> "ab"
                     "x" -> "xab"
                     "x" -> "xab" (consolidated)
                 Longer inserts
                     "" -> "abcde"
                 consolidateEditScript
                     consolidates two inserts
                     consolidates two deletes
                 QuickCheck
                     Arbitrary text
                         Single change
                         Multiple changes
                     Arbitrary document (series of arbitrary texts with plenty of newlines)
                         Single change
           Shutting down due to sigTERM...
                         Multiple changes
                             Async exception
                             SomeAsyncExceptionWithEq AsyncCancelled
```

Signed-off-by: Mihai Maruseac <[email protected]>

Author: mihaimaruseac

build-constraints/lts-24-build-constraints.yaml

@@ -6859,6 +6859,7 @@ expected-test-failures:
     - massiv-serialise
     - math-functions # https://github.com/bos/math-functions/issues/25
     - mltool # https://github.com/Alexander-Ignatyev/mltool/issues/1
+    - myers-diff
     - network # Unfortunately network failures seem to happen haphazardly
     - nsis # Intermittent on non-Windows systems
     - tdigest # 0.3.1 https://github.com/phadej/tdigest/issues/46