bugfix: Fix string code of BLAKE2S_ADD_UINT256 hint

[fmoletta]

Fixes small bug in the hint string that causes the match to fail when calling the common library function that uses the hint

Checklist

• Linked to Github Issue
• Unit tests added
• Integration tests added.
• This change requires new documentation.
  • Documentation has been added/updated.
  • CHANGELOG has been updated.

[codecov]

Codecov Report

Merging #1454 (ec18b29) into main (77f4d2c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1454   +/-   ##
=======================================
  Coverage   96.99%   96.99%           
=======================================
  Files          93       93           
  Lines       38791    38791           
=======================================
  Hits        37624    37624           
  Misses       1167     1167           

Files	Coverage Δ
..._processor/builtin_hint_processor/blake2s_utils.rs	99.77% <100.00%> (ø)

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[github-actions]

Benchmark Results for unmodified programs 🚀

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_factorial	5.087 ± 0.089	5.008	5.310	1.01 ± 0.02
head big_factorial	5.061 ± 0.045	4.996	5.117	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_fibonacci	4.292 ± 0.057	4.223	4.422	1.00
head big_fibonacci	4.401 ± 0.107	4.286	4.651	1.03 ± 0.03

Command	Mean [s]	Min [s]	Max [s]	Relative
base blake2s_integration_benchmark	11.406 ± 0.094	11.271	11.538	1.00 ± 0.01
head blake2s_integration_benchmark	11.380 ± 0.091	11.254	11.558	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base compare_arrays_200000	4.226 ± 0.044	4.138	4.289	1.00
head compare_arrays_200000	4.272 ± 0.081	4.183	4.432	1.01 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base dict_integration_benchmark	2.861 ± 0.048	2.816	2.961	1.01 ± 0.02
head dict_integration_benchmark	2.838 ± 0.036	2.791	2.899	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base field_arithmetic_get_square_benchmark	1.879 ± 0.017	1.843	1.904	1.00
head field_arithmetic_get_square_benchmark	1.918 ± 0.037	1.864	1.973	1.02 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base integration_builtins	11.116 ± 0.103	10.974	11.283	1.00
head integration_builtins	11.127 ± 0.036	11.081	11.206	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base keccak_integration_benchmark	11.620 ± 0.070	11.452	11.711	1.00 ± 0.01
head keccak_integration_benchmark	11.610 ± 0.068	11.512	11.732	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base linear_search	4.208 ± 0.051	4.139	4.287	1.01 ± 0.01
head linear_search	4.177 ± 0.035	4.141	4.239	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_cmp_and_pow_integration_benchmark	3.067 ± 0.044	2.999	3.129	1.00
head math_cmp_and_pow_integration_benchmark	3.075 ± 0.030	3.038	3.122	1.00 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_integration_benchmark	2.777 ± 0.030	2.724	2.818	1.00 ± 0.02
head math_integration_benchmark	2.767 ± 0.043	2.725	2.875	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base memory_integration_benchmark	2.511 ± 0.038	2.449	2.568	1.01 ± 0.02
head memory_integration_benchmark	2.477 ± 0.035	2.437	2.530	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base operations_with_data_structures_benchmarks	2.672 ± 0.027	2.629	2.711	1.01 ± 0.01
head operations_with_data_structures_benchmarks	2.636 ± 0.025	2.608	2.684	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base pedersen	963.5 ± 8.4	953.3	978.2	1.00
head pedersen	978.3 ± 17.5	963.1	1020.5	1.02 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base poseidon_integration_benchmark	1.843 ± 0.029	1.803	1.899	1.01 ± 0.02
head poseidon_integration_benchmark	1.830 ± 0.012	1.813	1.854	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base secp_integration_benchmark	3.615 ± 0.035	3.570	3.699	1.00 ± 0.01
head secp_integration_benchmark	3.614 ± 0.017	3.592	3.649	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base set_integration_benchmark	2.276 ± 0.023	2.242	2.304	1.02 ± 0.02
head set_integration_benchmark	2.234 ± 0.032	2.208	2.304	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base uint256_integration_benchmark	7.267 ± 0.117	7.135	7.443	1.02 ± 0.02
head uint256_integration_benchmark	7.157 ± 0.052	7.088	7.238	1.00