[gha] limit macos concurrent build to one

.github/workflows/build-osx.yml

@@ -1,49 +0,0 @@
-name: Build on OSX
-
-on:
-  push:
-    branches:
-    - '*'
-    paths:
-    - .github/workflows/build-osx.yml
-    - daemon/**
-    - i18n/**
-    - libi2pd/**
-    - libi2pd_client/**
-    - Makefile
-    - Makefile.homebrew
-    tags:
-    - '*'
-  pull_request:
-    branches:
-    - '*'
-
-jobs:
-  build:
-    name: Build on ${{ matrix.target-name }}
-    runs-on: ${{ matrix.target }}
-
-    strategy:
-      fail-fast: true
-      matrix:
-        include:
-          - target: macos-latest
-            target-name: ARM64
-          - target: macos-latest-large
-            target-name: Intel x86_64
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v4
-
-    - name: Install required formulae
-      run: |
-        find /usr/local/bin -lname '*/Library/Frameworks/Python.framework/*' -delete
-        brew update
-        brew install boost miniupnpc openssl@3.5
-
-    - name: List installed formulae
-      run: brew list
-
-    - name: Build application
-      run: make HOMEBREW=1 USE_UPNP=ON PREFIX=$GITHUB_WORKSPACE/output -j3