Use assign for deserialize instead of temporary std::string

[SamuelH91]

Description

At deserialize of fixed_string (cdr) or string (fastcdr) temporary std::string was used which may allocate memory dynamically, which is not desirable or needed especially if using fixed_strings.

@Mergifyio backport 1.0.x

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A Any new/modified methods have been properly documented using Doxygen.
• Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• Changes are API compatible.
• N/A New feature has been added to the versions.md file (if applicable).
• Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: CI pass and failing tests are unrelated with the changes.

[MiguelCompany]

@Mergifyio rebase

[mergify]

rebase

✅ Branch has been successfully rebased

[MiguelCompany]

LGTM with green CI

[MiguelCompany]

@SamuelH91 Thank you for your contribution and patience!

[MiguelCompany]

@Mergifyio backport 1.0.x

[mergify]

backport 1.0.x

✅ Backports have been created

• #257 Use assign for deserialize instead of temporary std::string (backport #241) has been created for branch 1.0.x but encountered conflicts