Fix SignerInfo packing issue (v1.0.0)

[immrsd]

Picks SignerInfo packing fix into the v1.0.0 release branch.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (release-v1.0.0@d493e25). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...ckages/governance/src/multisig/storage_utils.cairo	85.71%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             release-v1.0.0    #1316   +/-   ##
=================================================
  Coverage                  ?   95.17%           
=================================================
  Files                     ?       59           
  Lines                     ?     1493           
  Branches                  ?        0           
=================================================
  Hits                      ?     1421           
  Misses                    ?       72           
  Partials                  ?        0           

Files with missing lines	Coverage Δ
packages/governance/src/multisig/multisig.cairo	100.00% <ø> (ø)
...ckages/governance/src/multisig/storage_utils.cairo	92.85% <85.71%> (ø)

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[ericnordelo]

LGTM!