Fixed 'Advancing Bitcoin' video URL.

[tnull]

The old link lead to a shortened version of the talk. This should be the full recording now.

[codecov]

Codecov Report

Merging #1123 (8549b52) into main (dda86a0) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1123      +/-   ##
==========================================
- Coverage   90.58%   90.58%   -0.01%     
==========================================
  Files          66       66              
  Lines       34459    34459              
==========================================
- Hits        31215    31214       -1     
- Misses       3244     3245       +1     

Impacted Files	Coverage Δ
lightning-background-processor/src/lib.rs	93.75% <0.00%> (-0.49%)	⬇️

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