feat: support empty string for safe access operator

[w-lfchen]

Description

• Supersedes Support empty string for safe access operator Currently only an empty json string, i.e. a string in a string was supported: '""'. #629
  resolves it's changes requested here
• closes [BUG] Incorrect handling of an empty string by the safe access operator #1209

Additional Notes

This contains the breaking change of no longer supporting safe access for JSON strings (noted in the changelog).

Checklist

• I added my changes to CHANGELOG.md, if appropriate.
• The documentation in the docs/content/main directory has been adjusted to reflect my changes.
• I used cargo fmt to automatically format all code before committing

[w-lfchen]

i dropped the dependency updates, that should be done in a separate pr alongside updating to rust 1.81

[elkowar]

I think the breaking change regarding json strings definitely needs to be mentioned in the changelog, but I think conceptually it makes sense this way.