chore: bump mariadb driver to 1.2.1 to fix crash issue

[ruibaby]

What type of PR is this?

/area core
/kind bug
/milestone 2.17.x

What this PR does / why we need it:

升级 MariaDB 的原生驱动版本至 1.2.1，以解决无法正常部署的问题。

Which issue(s) this PR fixes:

Fixes #5534

Special notes for your reviewer:

测试方式：

./gradlew clean build -x check -x test --refresh-dependencies

docker build -t halohub/halo:mariadb-fix .

services:
  halo:
    image: halohub/halo:mariadb-fix
    restart: on-failure:3
    networks:
      halo_network:
    volumes:
      - ./halo2:/root/.halo2
    ports:
      - "8090:8090"
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8090/actuator/health/readiness"]
      interval: 30s
      timeout: 5s
      retries: 5
      start_period: 30s
    command:
      - --spring.r2dbc.url=r2dbc:pool:mariadb://halodb:3306/halo
      - --spring.r2dbc.username=root
      - --spring.r2dbc.password=jzm3h9t9jggo6ww
      - --spring.sql.init.platform=mariadb
      - --halo.external-url=http://localhost:8090/

  halodb:
    image: mariadb:latest
    container_name: mariadb
    restart: always
    networks:
      halo_network:
    environment:
      MYSQL_ROOT_PASSWORD: jzm3h9t9jggo6ww
      MYSQL_DATABASE: halo
    volumes:
      - ./db:/var/lib/mysql
networks:
  halo_network:

docker compose up

Does this PR introduce a user-facing change?

升级 MariaDB 的原生驱动版本至 [1.2.1](https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.2.1)，以解决使用 MariaDB 无法正常部署的问题。

[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.68%. Comparing base (5fdf6c0) to head (dbe0a56).
Report is 250 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6133      +/-   ##
============================================
- Coverage     56.91%   54.68%   -2.23%     
- Complexity     3319     3427     +108     
============================================
  Files           587      629      +42     
  Lines         18968    21209    +2241     
  Branches       1401     1482      +81     
============================================
+ Hits          10795    11599     +804     
- Misses         7594     9019    +1425     
- Partials        579      591      +12     

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