FindBoost: Add support for Boost 1.76

Update the list of known versions.

Run the command

    cmake -DBOOST_DIR=/path/to/boost_1_76_0 \
      -P Utilities/Scripts/BoostScanDeps.cmake

to extract dependencies from the 1.76.0 source tree.
They are the same as 1.75's dependencies, so just update
the version check for warning about newer versions.

Fixes: #22167
41 jobs for !6100 with FindBoost-1.76 in 14 minutes and 48 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Build
passed #5770296
linux docker build cmake manual
build:centos6-x86_64

00:02:16

passed #5770293
linux docker build cmake
build:debian10-iwyu

00:06:39

passed #5770297
linux-3.17 linux docker build cmake manual
build:fedora33-ninja

00:02:31

passed #5770295
linux-3.17 linux docker build cmake
build:fedora33-sphinx

00:06:43

passed #5770294
linux-3.17 linux docker build cmake
build:fedora33-tidy

00:04:52

manual #5770299
nonconcurrent xcode-12.4 shell macos cmake manual
build:macos-x86_64-makefiles
manual #5770298
nonconcurrent xcode-12.4 shell macos cmake manual
build:macos-x86_64-ninja
manual #5770300
nonconcurrent msvc-19.28-16.9 vs2019 shell windows cmake manual
build:windows-vs2019-x64-ninja
 
  Test
passed #5770301
x11 linux-3.17 linux docker cmake
test:fedora33-ninja

00:06:24

created #5770303
nonconcurrent xcode-12.4 shell macos cmake
test:macos-x86_64-makefiles
created #5770302
nonconcurrent xcode-12.4 shell macos cmake
test:macos-x86_64-ninja
created #5770304
nonconcurrent msvc-19.28-16.9 vs2019 shell windows cmake
test:windows-vs2019-x64-ninja
 
  Test Ext
passed #5770307
linux docker cuda-rt cmake
test:cuda10.2-nvidia

00:00:52

passed #5770305
linux-3.17 linux docker build cmake
test:debian10-ninja

00:05:09

passed #5770306
linux-3.17 linux docker build cmake
test:fedora33-makefiles

00:03:58

passed #5770308
linux-3.17 linux docker build cmake
test:fedora33-ninja-multi

00:02:58

created #5770309
concurrent xcode-12.4 shell macos cmake
test:macos-x86_64-xcode
created #5770310
concurrent msvc-19.28-16.9 vs2019 shell windows cmake
test:windows-vs2019-x64
 
  External
passed cdash

passed ghostflow-check-master

passed ghostflow-check-release

passed ghostflow-stager

passed cdash

passed cdash

passed cdash

passed cdash

passed cdash

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager