Load: Fix signed integer limit error.

[a2mpt]

When loading signed integer in cyaml__read_int(), the min to max range is set to only half of the supposed value:

• int8_t: -64 to 63
• short: -16384 to 16383
• int: -2^30 to 2^30-1
• long: -2^62 to 2^62-1

So if the data type is short, a value like 20000 or -20000 in the YAML file will cause:
libcyaml: ERROR: Load: Invalid INT value: '20000'

Should use UINT64_MAX instead of INT64_MAX in the shift, like that in this pull request. Another solution is do not divide the value by 2:
max = (INT64_MAX >> ((8 - schema->data_size) * 8));

[codecov]

Codecov Report

Merging #179 (2e233c6) into main (5206ece) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #179   +/-   ##
=======================================
  Coverage   97.13%   97.13%           
=======================================
  Files           9        9           
  Lines        1608     1608           
  Branches      347      347           
=======================================
  Hits         1562     1562           
  Misses         24       24           
  Partials       22       22           

Flag	Coverage Δ
unittests	97.13% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/load.c	99.20% <100.00%> (ø)

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[tlsa]

Splendid! Good spot, thanks! 😸

[tlsa]

Now released in v1.3.1.