docs: refresh README CI badges

Replace the retired Cirrus CI badge with the current GitHub Actions badge, label the Azure Pipelines badge, and remove stale public OSUOSL badges whose job pages no longer resolve.

Author: moluopro

README.md

@@ -2,15 +2,10 @@
 
 [![Join the chat at https://gitter.im/xianyi/OpenBLAS](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/xianyi/OpenBLAS?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
-Cirrus CI: [![Build Status](https://api.cirrus-ci.com/github/xianyi/OpenBLAS.svg?branch=develop)](https://cirrus-ci.com/github/xianyi/OpenBLAS)
+GitHub Actions: [![Build Status](https://github.com/OpenMathLib/OpenBLAS/actions/workflows/dynamic_arch.yml/badge.svg?branch=develop)](https://github.com/OpenMathLib/OpenBLAS/actions/workflows/dynamic_arch.yml?query=branch%3Adevelop)
 
+Azure Pipelines: [![Build Status](https://dev.azure.com/xianyi/OpenBLAS/_apis/build/status/xianyi.OpenBLAS?branchName=develop)](https://dev.azure.com/xianyi/OpenBLAS/_build/latest?definitionId=1&branchName=develop)
 
-
-[![Build Status](https://dev.azure.com/xianyi/OpenBLAS/_apis/build/status/xianyi.OpenBLAS?branchName=develop)](https://dev.azure.com/xianyi/OpenBLAS/_build/latest?definitionId=1&branchName=develop)
-
-OSUOSL POWERCI [![Build Status](https://powerci.osuosl.org/buildStatus/icon?job=OpenBLAS_gh%2Fdevelop)](http://powerci.osuosl.org/job/OpenBLAS_gh/job/develop/)
-
-OSUOSL IBMZ-CI [![Build Status](http://ibmz-ci.osuosl.org/buildStatus/icon?job=OpenBLAS-Z%2Fdevelop)](http://ibmz-ci.osuosl.org/job/OpenBLAS-Z/job/develop/)
 ## Introduction
 
 OpenBLAS is an optimized BLAS (Basic Linear Algebra Subprograms) library based on GotoBLAS2 1.13 BSD version.