fix gh actions macos builder (#5774)

.github/workflows/build.yml

@@ -294,7 +294,11 @@ jobs:
       - name: Install dependencies (MacOS)
         if: startsWith(matrix.os, 'macos')
         run: |
-          brew install boost openssl rapidjson p7zip create-dmg cmake tree
+          brew install openssl rapidjson p7zip create-dmg cmake tree
+          brew tap-new gh/local-boost
+          brew tap homebrew/core --force
+          brew extract --version=1.86.0 boost gh/local-boost
+          brew install boost@1.86.0
         shell: bash
 
       - name: Build (MacOS)

.github/workflows/test-macos.yml

@@ -57,7 +57,11 @@ jobs:
 
       - name: Install dependencies
         run: |
-          brew install boost openssl rapidjson p7zip create-dmg cmake
+          brew install openssl rapidjson p7zip create-dmg cmake
+          brew tap-new gh/local-boost
+          brew tap homebrew/core --force
+          brew extract --version=1.86.0 boost gh/local-boost
+          brew install boost@1.86.0
 
       - name: Install httpbox
         run: |

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unversioned
 
 - Bugfix: Fixed scrollbar highlights being visible in overlay windows. (#5769)
+- Dev: Hard-code Boost 1.86.0 in macos CI builders. (#5774)
 
 ## 2.5.2-beta.1