Fix workflows (XRPLF#4951)

- Update container for Doxygen workflow. Matches Linux workflow, with newer GLIBC version required by newer actions.
- Fixes macOS workflow to install and configure Conan correctly. Still fails on tests, but that does not seem attributable to the workflow.

.github/workflows/doxygen.yml

@@ -13,8 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: write
-    container:
-      image: docker://rippleci/rippled-ci-builder:2944b78d22db
+    container: rippleci/rippled-build-ubuntu:aaf5e3e
     steps:
       - name: checkout
         uses: actions/checkout@v4

.github/workflows/macos.yml

@@ -23,6 +23,10 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v4
+      - name: install Conan
+        run: |
+          brew install conan@1
+          echo '/opt/homebrew/opt/conan@1/bin' >> $GITHUB_PATH
       - name: install Ninja
         if: matrix.generator == 'Ninja'
         run: brew install ninja
@@ -35,7 +39,8 @@ jobs:
           cmake --version
       - name: configure Conan
         run : |
-          conan profile get env.CXXFLAGS default || true
+          conan profile new default --detect || true
+          conan profile update settings.compiler.cppstd=20 default
           conan profile update 'conf.tools.build:cxxflags+=["-DBOOST_ASIO_DISABLE_CONCEPTS"]' default
       - name: build dependencies
         uses: ./.github/actions/dependencies

.github/workflows/windows.yml

@@ -56,6 +56,7 @@ jobs:
         shell: bash
         run: |
           conan profile new default --detect
+          conan profile update settings.compiler.cppstd=20 default
           conan profile update settings.compiler.runtime=MT${{ matrix.configuration == 'Debug' && 'd' || '' }} default
       - name: build dependencies
         uses: ./.github/actions/dependencies