Updated change authorities fn

[zktony]

Describe your changes

Updated change authorities fn.

[codecov]

Codecov Report

Patch coverage: 24.73% and project coverage change: +4.97 🎉

Comparison is base (59a609b) 33.75% compared to head (7471af7) 38.73%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           mainnet-release     #839      +/-   ##
===================================================
+ Coverage            33.75%   38.73%   +4.97%     
===================================================
  Files                   64       47      -17     
  Lines                 4390     2822    -1568     
===================================================
- Hits                  1482     1093     -389     
+ Misses                2908     1729    -1179     

Impacted Files	Coverage Δ
client/src/lib.rs	0.00% <ø> (ø)
node/src/chain_spec.rs	0.00% <ø> (ø)
node/src/rpc.rs	0.00% <0.00%> (ø)
pallets/ocex/src/benchmarking.rs	0.00% <0.00%> (ø)
pallets/ocex/src/validator.rs	0.00% <0.00%> (ø)
pallets/ocex/src/weights.rs	0.00% <ø> (ø)
pallets/thea-executor/src/lib.rs	71.32% <0.00%> (+5.88%)	⬆️
pallets/thea-message-handler/src/benchmarking.rs	0.00% <ø> (ø)
pallets/thea-message-handler/src/weights.rs	0.00% <0.00%> (ø)
pallets/thea/src/benchmarking.rs	0.00% <ø> (ø)
... and 13 more

... and 2 files with indirect coverage changes

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