Bump cleaver version

[jcfr]

• Avoid triggering GitHub Actions workflow on both upstream and fork
• Bump Cleaver version to integrate build-system updates

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See https://github.com/SCIInstitute/cleaver/compare/bb1d7e060...7b68a58b1

List of changes:

$ git shortlog bb1d7e060..7b68a58b1 --no-merges
Jean-Christophe Fillion-Robin (32):
      ENH: Add GitHub workflow configuration for testing on macOS, Ubuntu and Windows
      COMP: Fix initialization of build-type to support multi-config CMake generator
      COMP: Update GitHub workflow to install Qt5 and build Cleaver GUI
      COMP: Set CMAKE_POSITION_INDEPENDENT_CODE instead of specifying -fPIC flag
      COMP: Set CMAKE_CXX_STANDARD instead of specifying -std=c++11 flag
      COMP: Remove obsolete CMake commands from Cleaver GUI CMakeLists.txt
      COMP: Consistently glob all headers and sources in Cleaver GUI CMakeLists.txt
      COMP: Simplify Qt5 integration looking up Qt5 module
      COMP: Fix macOS GitHub Actions workflow using current macos-11 image
      DOC: Improve README adding Overview/Method/Documentation/Authors/Acknowledgment/Citing
      DOC: Remove empty & unused "Indices and tables" section
      DOC: Improve "Authors" section
      DOC: Rename "Cleaver2" to "Cleaver" in docstrings and manual
      ENH: Rename "Cleaver2" to "Cleaver" in CLI and GUI applications
      ENH: Update obsolete documentation URL in GUI application About dialog
      DOC: Fix documentation build warnings
      DOC: Update conf.py updating comments
      DOC: Ensure Copyright year reported in generated documentation is current
      DOC: Cleanup requirements.txt
      DOC: Update Cleaver bibliography
      DOC: Ensure Cleaver is referenced consistently
      DOC: Convert index from reStructuredText to MyST Markdown
      STYLE: Update .gitignore to ensure only exclude top-level build directories
      DOC: Remove "layout.html" template not supported by "furo" theme
      DOC: Re-organize documentation
      DOC: Improve ITK build instructions
      DOC: Simplify build instructions using Qt5_DIR and referencing Qt 5.15.2
      DOC: Update build instructions
      DOC: Migrate Read the Docs settings to file and switch from python 3.7 to 3.9
      COMP: Simplify CLIs build-system
      COMP: Fix build of Cleaver library in project directly adding Cleaver sources
      COMP: Fix build of Cleaver CLIs in project directly adding Cleaver sources

Jess Tate (2):
      DOC: Fix typo in contributor name
      DOC: Fix link referencing SCI Institute software page

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