Bump Oasis Core to 26.0

[kostko]

No description provided.

[netlify]

✅ Deploy Preview for oasisprotocol-oasis-sdk canceled.

Name	Link
🔨 Latest commit	e0f72ed
🔍 Latest deploy log	https://app.netlify.com/projects/oasisprotocol-oasis-sdk/deploys/698ef2a6a191ce0008b0facd

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 25.69%. Comparing base (3c5c665) to head (e0f72ed).

❗ There is a different number of reports uploaded between BASE (3c5c665) and HEAD (e0f72ed). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (3c5c665)	HEAD (e0f72ed)
	4	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2431       +/-   ##
===========================================
- Coverage   48.64%   25.69%   -22.96%     
===========================================
  Files         224       42      -182     
  Lines       16104     2448    -13656     
===========================================
- Hits         7834      629     -7205     
+ Misses       8210     1759     -6451     
  Partials       60       60               

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