chore: switch master branch to use v1.2.0

[andyzhangx]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
chore: switch master branch to use v1.2.0

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

git checkout -b switch-master-1.2.0
sed -i 's/1.1.0/1.2.0/g' Makefile
cd charts/latest/
sed -i 's/1.1.0/1.2.0/g' azurefile-csi-driver/Chart.yaml
helm package azurefile-csi-driver
git rm azurefile-csi-driver-v1.1.0.tgz
git add azurefile-csi-driver-v1.2.0.tgz
cd ../../
helm repo index charts --url=https://raw.githubusercontent.com/kubernetes-sigs/azurefile-csi-driver/master/charts
$git_commit

Release note:

chore: switch master branch to use v1.2.0

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [andyzhangx]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment