_incrementorTemplate() {
    return html`
      <button
        ?disabled=${this.disabled || this.readOnly}
        @click=${this.__increment}
        @focus=${this._onEnterButton}
        @blur=${this._onLeaveButton}
        type="button"
        aria-label="${this.msgLit('lion-input-stepper:increase')}"
      >
        ${this._incrementorSignTemplate()}
      </button>
    `;
  }
Get the decrement button template
@returns {import('lit').TemplateResult}
@protected