[Doc] Remove old ROOT versions from the build status table

consider only ROOT 6.14 and 6.12 removing 6.10 and 5.34.

README.md

@@ -36,8 +36,6 @@ acquisition, simulation and data analysis systems.
 | master-noimt | [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-incremental-master-noimt)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-incremental-master-noimt/) | [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-nightly-master-noimt)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-nightly-master-noimt/) |
 | v6-14-00-patches |  [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-incremental-v6-14-00-patches)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-incremental-v6-14-00-patches/) | [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-nightly-v6-14-00-patches)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-nightly-v6-14-00-patches/) |
 | v6-12-00-patches |  [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-incremental-v6-12-00-patches)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-incremental-v6-12-00-patches/) | [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-nightly-v6-12-00-patches)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-nightly-v6-12-00-patches/) |
-| v6-10-00-patches |  [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-incremental-v6-10-00-patches)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-incremental-v6-10-00-patches/) | [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-nightly-v6-10-00-patches)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-nightly-v6-10-00-patches/) |
-| v5-34-00-patches | [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-incremental-v5-34-00-patches)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-incremental-v5-34-00-patches/) | [![Build Status](https://epsft-jenkins.cern.ch/buildStatus/icon?job=root-nightly-v5-34-00-patches)](https://epsft-jenkins.cern.ch/view/ROOT/job/root-nightly-v5-34-00-patches/) |
 
 ## Cite
 We are [![DOI](https://zenodo.org/badge/10994345.svg)](https://zenodo.org/badge/latestdoi/10994345)