Replaced boostorg.jfrog.io to archives.boost.io URLs

[TheNetos]

• I've checked this Git style guide. [Yes]
• I've checked this CMake style guide. [Yes]
• My change will work with CMake 3.5 (minimum requirement for Hunter). [Yes]
• I will try to keep this pull request as small as possible and will try not to mix unrelated features. [Yes]

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Fix for #770.

The change will affect #759 (URL will need to be changed).

SHA1 has not changed.

SHA1 for changed URLs

https://archives.boost.io/release/1.65.0/source/boost_1_65_0.tar.bz2  f9260074ecfb31f3e65322fae9c15cc423c0ad59
https://archives.boost.io/release/1.65.1/source/boost_1_65_1.tar.bz2  4a5b0c3c1b1b9a4d6cb6a6cc395e903e76f76720
https://archives.boost.io/release/1.66.0/source/boost_1_66_0.7z       075d0b43980614054b1f1bafd189f863bba6600e
https://archives.boost.io/release/1.67.0/source/boost_1_67_0.7z       64c278c23defe155e630a307ae2c0615348b14b3
https://archives.boost.io/release/1.75.0/source/boost_1_75_0.tar.bz2  6109efd3bdd8b9220d7d85b5e125f7f28721b9a9
https://archives.boost.io/release/1.76.0/source/boost_1_76_0.tar.bz2  8064156508312dde1d834fec3dca9b11006555b6
https://archives.boost.io/release/1.77.0/source/boost_1_77_0.tar.bz2  0cb4f947d094fc311e13ffacaff00418130ef5ef
https://archives.boost.io/release/1.78.0/source/boost_1_78_0.tar.bz2  7ccc47e82926be693810a687015ddc490b49296d
https://archives.boost.io/release/1.79.0/source/boost_1_79_0.tar.bz2  31209dcff292bd6a64e5e08ceb3ce44a33615dc0
https://archives.boost.io/release/1.80.0/source/boost_1_80_0.tar.bz2  690a2a2ed6861129828984b1d52a473d2c8393d1
https://archives.boost.io/release/1.81.0/source/boost_1_81_0.tar.bz2  898469f1ae407f5cbfca84f63ad602962eebf4cc
https://archives.boost.io/release/1.82.0/source/boost_1_82_0.tar.bz2  5c0736ce8d6f0d21275a1d9407dce48e6decce6a
https://archives.boost.io/release/1.83.0/source/boost_1_83_0.tar.bz2  75b1f569134401d178ad2aaf97a2993898dd7ee3

[TheNetos]

@NeroBurner, need your time here, please 🙂

[NeroBurner]

Lgtm. Thanks!