DOC v5.0.0.3512 for v1.2.3 release

docs/releases/v5_0_0_3512-x86_64.md

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+# libhkl-v5.0.0.3512-x86_64.tar.gz
+
+[v1.2.3](https://github.com/bluesky/libhkl/releases/tag/v1.2.3) | `libhkl-v5.0.0.3512-x86_64.tar.gz`
+
+package | version
+--- | ---
+sha256 | `d8a541dadca87424bfe0ed46122a6efb88684988f9cf32b5f7a7ed2ccb9c93b8`
+built on | [Docker](https://github.com/bluesky/libhkl/tree/main/builder)
+architecture | x86_64
+OS | debian:11
+`gobject-introspection` | 1.66.1 (installed by apt)
+`libgsl-dev` | 2.6 (installed by apt)
+
+Packaging requirements to build a conda-forge package with this library:
+
+```text
+    gobject-introspection
+    gsl==2.6 
+    libcblas
+    pygobject
+```
+
+NOTE!! conda-forge::gsl 2.6 installs as libgsl.so.25
+
+NOTE: The specific versions of `gobject-introspection` and `gsl` are limited by
+what is available on conda-forge for the target versions of Python and what is
+available for the compiler to build the library. To get later versions and use
+contemporary Python versions, need to build these somewhere else than GitHub
+Actions workflows.
+