Update JSONTokener.java for #1007

[eleumik]

fixed parse of 0. in strict mode

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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[stleary]

Please fix the blocking SonarQube issue

For future reference, it's better to combine small related fixes like #1008 and #1009, to simplify review testing.

[stleary]

Please add unit tests (see comment for #1008)

[stleary]

What problem does this code solve?
Strict mode was not checking for number ending with '.'

Does the code still compile with Java6?
Yes

Risks
Low

Changes to the API?
No

Will this require a new release?
No

Should the documentation be updated?
No

Does it break the unit tests?
No, but new unit tests are needed. Code review action item left

Was any code refactored in this commit?
No

Review status
APPROVED

Starting 3-day comment window

[stleary]

@eleumik PR is approved, but please add unit test coverage and fix the SonarQube issues. Otherwise, I will add update the code after the merge.

[stleary]

Open comments will be addresssed in a future commit