GHA CI: explicitly set C++20 mode for libtorrent

Bump Boost version. Boost::asio 1.76 has a bug that prevents compiling in C++20 mode.

PR #22245.

.github/workflows/ci_macos.yaml

@@ -93,7 +93,7 @@ jobs:
             -G "Ninja" \
             -DBUILD_SHARED_LIBS=OFF \
             -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-            -DCMAKE_CXX_STANDARD=17 \
+            -DCMAKE_CXX_STANDARD=20 \
             -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
             -DBOOST_ROOT="${{ env.boost_path }}" \
             -Ddeprecated-functions=OFF

.github/workflows/ci_ubuntu.yaml

@@ -52,7 +52,7 @@ jobs:
       - name: Install boost
         env:
           BOOST_MAJOR_VERSION: "1"
-          BOOST_MINOR_VERSION: "76"
+          BOOST_MINOR_VERSION: "77"
           BOOST_PATCH_VERSION: "0"
         run: |
           boost_url="https://archives.boost.io/release/${{ env.BOOST_MAJOR_VERSION }}.${{ env.BOOST_MINOR_VERSION }}.${{ env.BOOST_PATCH_VERSION }}/source/boost_${{ env.BOOST_MAJOR_VERSION }}_${{ env.BOOST_MINOR_VERSION }}_${{ env.BOOST_PATCH_VERSION }}.tar.gz"
@@ -88,6 +88,7 @@ jobs:
             -G "Ninja" \
             -DBUILD_SHARED_LIBS=OFF \
             -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+            -DCMAKE_CXX_STANDARD=20 \
             -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
             -DBOOST_ROOT="${{ env.boost_path }}" \
             -Ddeprecated-functions=OFF

.github/workflows/ci_windows.yaml

@@ -118,6 +118,7 @@ jobs:
             -B build `
             -G "Ninja" `
             -DCMAKE_BUILD_TYPE=RelWithDebInfo `
+            -DCMAKE_CXX_STANDARD=20 `
             -DCMAKE_EXPORT_COMPILE_COMMANDS=ON `
             -DCMAKE_INSTALL_PREFIX="${{ env.libtorrent_path }}/install" `
             -DCMAKE_TOOLCHAIN_FILE="${{ env.vcpkg_path }}/scripts/buildsystems/vcpkg.cmake" `

.github/workflows/coverity-scan.yaml

@@ -73,6 +73,7 @@ jobs:
             -B build \
             -G "Ninja" \
             -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+            -DCMAKE_CXX_STANDARD=20 \
             -DBOOST_ROOT="${{ env.boost_path }}" \
             -Ddeprecated-functions=OFF
           cmake --build build