libcurl included as external library outdated

[cengique]

Included version of libcurl is at 7.35.0 while Github actions provides a system version at 7.74:

In file included from external/restclient/../libcurl-7.35.0/curl/curl.h:33,
                 from external/restclient/restclient.cpp:18:
external/restclient/../libcurl-7.35.0/curl/curlver.h:29: warning: "LIBCURL_COPYRIGHT" redefined
   29 | #define LIBCURL_COPYRIGHT "1996 - 2014 Daniel Stenberg, <[email protected]>."
      | 
In file included from /usr/include/x86_64-linux-gnu/curl/curl.h:37,
                 from external/restclient/../../src/client/cl_curl.h:29,
                 from external/restclient/restclient.cpp:16:
/usr/include/x86_64-linux-gnu/curl/curlver.h:29: note: this is the location of the previous definition
   29 | #define LIBCURL_COPYRIGHT "1996 - 2020 Daniel Stenberg, <[email protected]>."
...

Proposed solution:

• Either disable re-including libcurl within rest library
• Or install new version from https://curl.se/download.html

[cengique]

Fixed in #130