DM: update contact information of DM

[luzizhuo]

What problem does this PR solve?

update the contact information of DM.
Issue Number: ref #34452

Problem Summary:

What is changed and how it works? readme.md

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• djshow832
• xhebox

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[sre-bot]

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/41d2e634ea9f2c1278bcb3ec4f89f47edacb346b

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[Mini256]

/run-check_title

[luzizhuo]

/cc @winkyao @hawkingrei @XuHuaiyu @Tammyxia @andylokandy @zz-jason

[hawkingrei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: bc9cbc6

[sre-bot]

TiDB MergeCI notify

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci/integration-cdc-test	🟢 all 35 tests passed	31 min	Existing passed
idc-jenkins-ci-tidb/integration-common-test	🟢 all 11 tests passed	15 min	Existing passed
idc-jenkins-ci-tidb/common-test	🟢 all 12 tests passed	12 min	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	9 min 32 sec	Existing passed
idc-jenkins-ci-tidb/integration-ddl-test	🟢 all 6 tests passed	8 min 15 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	5 min 52 sec	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	5 min 4 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	3 min 3 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	2 min 42 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed