Fix warnings from CMake version 3.31 (#8227)

CMake 3.31 (released [last
November](https://www.kitware.com/cmake-3-31-0-available-for-download/))
deprecated compatibility with CMake versions older than 3.10, causing
warnings when running commands like `cmake --preset default` in the
Slang repo:

```
CMake Deprecation Warning at external/miniz/CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 3.10 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.


CMake Deprecation Warning at external/lz4/build/cmake/CMakeLists.txt:13 (cmake_minimum_required):
  Compatibility with CMake < 3.10 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.
```

Those dependencies modified their `cmake_minimum_required` calls in
lz4/lz4#1601 and richgel999/miniz#344 respectively to fix those
warnings, so this PR bumps them both to include those changes.

Co-authored-by: Ellie Hermaszewska <ellieh@nvidia.com>

2 files changed, 0 insertions, 0 deletions

diff --git a/external/lz4 b/external/lz4
-Subproject 039ab4696526378ec0d111058b48305964284bf
+Subproject 7f71be01f2c6f6b2c3cddb67eef8c38eab12ffd
diff --git a/external/miniz b/external/miniz
-Subproject 18795fa61e590521381ba9e1fa4a4ab362b095f
+Subproject 6ef6c68f4fcbb8287aa8edf9c6670804932f41c