[release/3.1] #28183 Fix OSX native dependency installation

* Avoid upgrading packages that are explicitly installed.
* Use a brewfile
* Change shebang to use bash and directly execute.

eng/Brewfile

@@ -0,0 +1,2 @@
+brew "icu4c"
+brew "openssl"

eng/build-job.yml

@@ -94,7 +94,7 @@ jobs:
     # and FreeBSD builds use a build agent with dependencies
     # preinstalled, so we only need this step for OSX and Windows.
     - ${{ if eq(parameters.osGroup, 'OSX') }}:
-      - script: sh eng/install-native-dependencies.sh $(osGroup)
+      - script: $(Build.SourcesDirectory)/eng/install-native-dependencies.sh $(osGroup)
         displayName: Install native dependencies
     - ${{ if eq(parameters.osGroup, 'Windows_NT') }}:
       # Necessary to install python

eng/install-native-dependencies.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 if [ "$1" = "Linux" ]; then
     sudo apt update
@@ -14,7 +14,9 @@ elif [ "$1" = "OSX" ]; then
     if [ "$?" != "0" ]; then
         exit 1;
     fi
-    brew install icu4c openssl
+
+    engdir=$(dirname "${BASH_SOURCE[0]}")
+    brew bundle --no-upgrade --no-lock --file "${engdir}/Brewfile"
     if [ "$?" != "0" ]; then
         exit 1;
     fi
@@ -26,4 +28,3 @@ else
     echo "Must pass \"Linux\" or \"OSX\" as first argument."
     exit 1
 fi
-