Fixup: ] dev ../.. for train-kernel-parameters example

[st--]

Had overlooked this in #430, sorry:(
Also upgrades Manifest.toml to version 2 & ] up.

[codecov]

Codecov Report

Merging #441 (29a0061) into master (6033b56) will increase coverage by 9.91%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #441      +/-   ##
==========================================
+ Coverage   83.21%   93.13%   +9.91%     
==========================================
  Files          52       52              
  Lines        1251     1252       +1     
==========================================
+ Hits         1041     1166     +125     
+ Misses        210       86     -124     

Impacted Files	Coverage Δ
src/distances/dotproduct.jl	90.00% <0.00%> (+10.00%)	⬆️
src/transform/periodic_transform.jl	50.00% <0.00%> (+10.00%)	⬆️
src/distances/delta.jl	100.00% <0.00%> (+14.28%)	⬆️
src/matrix/kernelmatrix.jl	100.00% <0.00%> (+16.32%)	⬆️
src/distances/sinus.jl	81.81% <0.00%> (+18.18%)	⬆️
src/generic.jl	100.00% <0.00%> (+20.00%)	⬆️
src/utils.jl	91.13% <0.00%> (+20.25%)	⬆️
src/chainrules.jl	83.95% <0.00%> (+25.92%)	⬆️
src/matrix/kernelpdmat.jl	81.81% <0.00%> (+81.81%)	⬆️
src/approximations/nystrom.jl	92.50% <0.00%> (+92.50%)	⬆️
... and 1 more

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