Update SQLCipher to 4.15.0 and add skill

[bbirman]

No description provided.

[bbirman]

Used my fork for testing, would need to update this before merging. Depends on the specs repo PR here: forcedotcom/SalesforceMobileSDK-iOS-Specs#60

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SmartStore iOS ^18 Test Results	177 ran	177 ✅

Test	Result
No test annotations available

• View SmartStore iOS ^18 Test Results

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.56%. Comparing base (ecd7897) to head (d3b1ee1).
⚠️ Report is 6 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4025      +/-   ##
==========================================
- Coverage   70.53%   65.56%   -4.98%     
==========================================
  Files         245      245              
  Lines       21449    21449              
==========================================
- Hits        15129    14062    -1067     
- Misses       6320     7387    +1067     

Components	Coverage Δ
Analytics	70.78% <ø> (ø)
Common	71.16% <ø> (-0.19%)	⬇️
Core	57.51% <ø> (-7.71%)	⬇️
SmartStore	73.44% <ø> (ø)
MobileSync	88.82% <ø> (ø)
see 37 files with indirect coverage changes

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[github-actions]

	Tests	Passed ✅	Skipped	Failed
SmartStore iOS ^26 Test Results	177 ran	177 ✅

Test	Result
No test annotations available

• View SmartStore iOS ^26 Test Results

[github-actions]

	Tests	Passed	Skipped	Failed ❌️
AuthFlowTester UI Test Results all	1 ran			1 ❌

Test	Result
AuthFlowTester UI Test Results all
AuthFlowTesterUITests.xctest
LegacyLoginTests.testCAOpaque_DefaultScopes_WebServerFlow()	❌ failure

• View AuthFlowTester UI Test Results all

[sfdctaka]

LGTM!