Add the RTLD_NODELETE flag to dlopen (#1030)

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**Context:**

There are segfault issue for finite-shot hermitians tests with Catalyst
on arm64-macos. It looks like closing `libscipy_openblas.dylib` has a
side effect that leads to the segfault and using `RTLD_NODELETE`
mitigates that.

**Description of the Change:**

**Benefits:**

**Possible Drawbacks:**

**Related GitHub Issues:**
[sc-80901]

---------

Co-authored-by: ringo-but-quantum <github-ringo-but-quantum@xanadu.ai>

.github/CHANGELOG.md

@@ -98,6 +98,9 @@
 
 ### Bug fixes
 
+* Add `RTLD_NODELETE` flag to `dlopen` in order to mitigate the segfault issues for arm64-macos Catalyst support.
+  [(#1030)](https://github.com/PennyLaneAI/pennylane-lightning/pull/1030)
+
 * Set rpath with `@loader_path` instead of `$ORIGIN` for macOS.
   [(#1029)](https://github.com/PennyLaneAI/pennylane-lightning/pull/1029)
 

pennylane_lightning/core/_version.py

@@ -16,4 +16,4 @@
    Version number (major.minor.patch[-label])
 """
 
-__version__ = "0.40.0-dev40"
+__version__ = "0.40.0-dev41"

pennylane_lightning/core/src/utils/SharedLibLoader.hpp

@@ -56,7 +56,10 @@ class SharedLibLoader final {
   public:
     SharedLibLoader();
     explicit SharedLibLoader(const std::string &filename) {
-        handle_ = PL_DLOPEN(filename.c_str(), RTLD_LAZY);
+        // NOTE: RTLD_NODELETE flag is a temporary solution. It could be
+        // problematic if the shared library is not static stored in memory and
+        // runtime unloaded is needed. Come back to this later.
+        handle_ = PL_DLOPEN(filename.c_str(), RTLD_LAZY | RTLD_NODELETE);
         PL_ABORT_IF(!handle_, PL_DLERROR());
     }