CompatHelper: add new compat entry for Mooncake at version 0.4 for package benchmarks, (keep existing compat)

[github-actions]

This pull request sets the compat entry for the Mooncake package to 0.4 for package benchmarks.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.
Note: Consider registering a new release of your package immediately after merging this PR, as downstream packages may depend on this for tests to pass.

[github-actions]

Benchmark Report for Commit dfd4bed

Computer Information

Julia Version 1.11.5
Commit 760b2e5b739 (2025-04-14 06:53 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 4 × AMD EPYC 7763 64-Core Processor
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, znver3)
Threads: 1 default, 0 interactive, 1 GC (on 4 virtual cores)

Benchmark Results

|                 Model | Dimension |  AD Backend |      VarInfo Type | Linked | Eval Time / Ref Time | AD Time / Eval Time |
|-----------------------|-----------|-------------|-------------------|--------|----------------------|---------------------|
| Simple assume observe |         1 | forwarddiff |             typed |  false |                  9.2 |                 1.6 |
|           Smorgasbord |       201 | forwarddiff |             typed |  false |                699.3 |                36.0 |
|           Smorgasbord |       201 | forwarddiff | simple_namedtuple |   true |                289.1 |                65.4 |
|           Smorgasbord |       201 | forwarddiff |           untyped |   true |               1199.9 |                27.2 |
|           Smorgasbord |       201 | forwarddiff |       simple_dict |   true |               3457.7 |                22.2 |
|           Smorgasbord |       201 | reversediff |             typed |   true |               1388.0 |                29.5 |
|           Smorgasbord |       201 |    mooncake |             typed |   true |                908.9 |                 5.3 |
|    Loop univariate 1k |      1000 |    mooncake |             typed |   true |               5242.4 |                 4.2 |
|       Multivariate 1k |      1000 |    mooncake |             typed |   true |                979.3 |                 8.8 |
|   Loop univariate 10k |     10000 |    mooncake |             typed |   true |              59481.0 |                 3.7 |
|      Multivariate 10k |     10000 |    mooncake |             typed |   true |               8434.7 |                10.4 |
|               Dynamic |        10 |    mooncake |             typed |   true |                124.5 |                13.7 |
|              Submodel |         1 |    mooncake |             typed |   true |                 13.1 |                 6.3 |
|                   LDA |        12 | reversediff |             typed |   true |                429.0 |                 5.5 |