small adjustment to how a system-provided libCURL is searched for

[ptahmose]

Description

We used find_package(CURL CONFIG QUIET) to pull in an externally provided libcurl-library, which means that CMake is only looking for package configuration files (CURLConfig.cmake or curl-config.cmake file). However, those files are not provided e.g. by Debian's 'libcurl4-openssl-dev'-package. So, we fall back to CMake's standard search procedure if find_package(CURL CONFIG QUIET) fails and try again with find_package(CURL QUIET).
This allows us to use the apt-package without further ado in building libCZI, saving quite some time compared to otherwise having to build libcurl ourselves (with vcpkg or as part of libCZI-build).

I chose to bump the version number here, in order to be able to mention this change in the changelog.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

In a codespace

Checklist:

• I followed the Contributing Guidelines.
• I did a self-review.
• I commented my code, particularly in hard-to-understand areas.
• I updated the documentation.
• I updated the version of libCZI following Versioning of libCZI depending on the type of change
  • Bug fix -> PATCH
  • New feature -> MINOR
  • Breaking change -> MAJOR
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aff047d) 65.38% compared to head (58e6c9c) 65.38%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   65.38%   65.38%           
=======================================
  Files          83       83           
  Lines       10621    10621           
=======================================
  Hits         6945     6945           
  Misses       3676     3676           

Flag	Coverage Δ
windows-latest	65.38% <ø> (ø)

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