ci: Update XRPLF/actions

[mathbunnyru]

High Level Overview of Change

To use these 2:

• fix: Don't use github.var directly actions#107
• release: Allow release prefix actions#110

Context of Change

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.1%. Comparing base (cce4cfe) to head (238a512).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #7281     +/-   ##
=========================================
- Coverage     82.1%   82.1%   -0.0%     
=========================================
  Files         1010    1010             
  Lines        76268   76268             
  Branches      7445    7419     -26     
=========================================
- Hits         62608   62587     -21     
- Misses       13660   13681     +21     

see 10 files with indirect coverage changes

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