Migrate httr to httr2 and Update Dependencies in devtools

[jhk0530]

Migration from httr to httr2:

• Replaced httr dependency with httr2 in relevant functions for better handling of HTTP requests.
• Updated related functions (check_mac_release, upload_cran, etc.) to use httr2 APIs (request, req_body_multipart, req_perform, etc.).

Dependency Updates:

• Added httr2 (≥ 1.1.2) and mime (≥ 0.13) to DESCRIPTION.
• Updated NAMESPACE to include necessary imports from httr2, mime, and other packages.

But, If it doesn't fit with the direction of the package, feel free to modify it with a Suggests

Note

• Copied same upload_file() function from httr to utils.R since httr2::req_body_multipart requires to input made by curl::form_file.

• R CMD Check was fine

• source_url was fine

• check_mac_release was fine

• submit_cran (contains upload_cran) was fine, but need double check.

[jhk0530]

#2602 #2603