Sync eng/common directory with azure-sdk-tools for PR 8457 (#36113)

* Update macos image from 11 to latest

* unpin pester now that 5.6.0 is on the agent

---------

Co-authored-by: Wes Haggard <[email protected]>

Author: azure-sdk

eng/common/pipelines/templates/stages/archetype-sdk-tool-pwsh.yml

@@ -29,7 +29,7 @@ stages:
               Image: ubuntu-22.04
             Mac:
               Pool: Azure Pipelines
-              Image: macos-11
+              Image: macos-latest
 
         pool:
           name: $(Pool)

eng/common/pipelines/templates/steps/run-pester-tests.yml

@@ -13,10 +13,8 @@ parameters:
 
 steps:
 
-  # Lock Pester to 5.5.0. The reason being is that the signing of 5.6.0 is different and Windows complains.
-  # The tracking issue: https://github.com/Azure/azure-sdk-tools/issues/8395
   - pwsh: |
-       Install-Module -Name Pester -RequiredVersion 5.5.0 -Force
+       Install-Module -Name Pester -Force
     displayName: Install Pester
 
    # default test steps