Fix includes in memspace test fixtures

This file uses `std::find` and `std::any_of` which are part of the
`<algorithm>` header, but it wasn't including it.

When building with gcc 14 this caused build issues such as:

```
memspace_fixtures.hpp:204:26: error: ‘any_of’ is not a member of ‘std’
```

With this patch adding the include building UMF with gcc 14 works fine.

Author: npmiller

test/memspaces/memspace_fixtures.hpp

@@ -5,6 +5,7 @@
 #ifndef UMF_TEST_MEMSPACE_FIXTURES_HPP
 #define UMF_TEST_MEMSPACE_FIXTURES_HPP
 
+#include <algorithm>
 #include <numa.h>
 #include <numaif.h>
 #include <thread>