Fortran CTest Failure on Alpine

**Describe the bug**

```
-- COMMAND: /home/runner/work/hdf5/hdf5/build/bin/testhdf5_fortran
CMake Error at /home/runner/work/hdf5/hdf5/config/cmake/runTest.cmake:83 (string):
string sub-command REGEX, mode MATCH needs at least 5 arguments total to
command.
```

**Expected behavior**
All tests pass.

**Platform (please complete the following information)**
- HDF5 version: develop
- OS and version: Alpine
- Compiler and version:
- Build system (e.g. CMake version) and generator (e.g. XCode, Ninja): CMake
- Any configure options you specified: release mode & enable fortran
- MPI library and version (parallel HDF5): n/a

**Additional context**
https://my.cdash.org/builds/2880254