build(maven): use the Jandex Maven plugin from SmallRye rather than JBoss

[jponge]

This relocation had gone un-noticed, causing Mutiny to use an older Jandex.

[codecov]

Codecov Report

Merging #1384 (c9a74cb) into main (b7456e4) will decrease coverage by 0.03%.
Report is 16 commits behind head on main.
The diff coverage is n/a.

❗ Current head c9a74cb differs from pull request most recent head 083e3be. Consider uploading reports for the commit 083e3be to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1384      +/-   ##
============================================
- Coverage     89.17%   89.14%   -0.03%     
+ Complexity     3360     3356       -4     
============================================
  Files           459      459              
  Lines         13438    13438              
  Branches       1655     1655              
============================================
- Hits          11983    11979       -4     
- Misses          807      810       +3     
- Partials        648      649       +1     

see 17 files with indirect coverage changes