Default theme bootstrap handles lack contrast

The handles in the notification dropdown

WCAG warnings in the test class [org.xwiki.platform.notifications.test.ui.AllIT]:
__________
Validation in the test method [notificationsEmails]
Check for [org.xwiki.platform.notifications.test.po.NotificationsTrayPage] at http://xwikiweb:8080/xwiki/bin/view/XWiki/NotificationsEmailsITuser2?category=notifications.
Found [3] items

1: Elements must have sufficient color contrast
Description: Ensures the contrast between foreground and background colors meets WCAG 2 AA contrast ratio thresholds
Help URL: https://dequeuniversity.com/rules/axe/4.6/color-contrast?application=axeAPI
Help: Elements must have sufficient color contrast
Impact: serious
Tags: cat.color, wcag2aa, wcag143, ACT

HTML element:
<span class="bootstrap-switch-handle-on bootstrap-switch-primary" style="width: 44px;">ON</span>
Selector: [.notificationAppCell[data-format="alert"] > .bootstrap-switch-small.bootstrap-switch-indeterminate.bootstrap-switch-off > .bootstrap-switch-container > .bootstrap-switch-handle-on.bootstrap-switch-primary]
Fix any of the following:
Element has insufficient color contrast of 1.55 (foreground color: #c6d8e7, background color: #8cb0ce, font size: 9.0pt (12px), font weight: normal). Expected contrast ratio of 4.5:1

HTML element:
<span class="bootstrap-switch-handle-off bootstrap-switch-default" style="width: 44px;">OFF</span>
Selector: [.notificationAppCell[data-format="alert"] > .bootstrap-switch-small.bootstrap-switch-indeterminate.bootstrap-switch-off > .bootstrap-switch-container > .bootstrap-switch-handle-off.bootstrap-switch-default]
Fix any of the following:
Element has insufficient color contrast of 3.82 (foreground color: #757575, background color: #eaeaea, font size: 9.0pt (12px), font weight: normal). Expected contrast ratio of 4.5:1

HTML element:
<span class="bootstrap-switch-handle-on bootstrap-switch-primary" style="width: 44px;">ON</span>
Selector: [.notificationAppCell[data-format="email"] > .bootstrap-switch-small.bootstrap-switch-indeterminate.bootstrap-switch-off > .bootstrap-switch-container > .bootstrap-switch-handle-on.bootstrap-switch-primary]
Fix any of the following:
Element has insufficient color contrast of 1.55 (foreground color: #c6d8e7, background color: #8cb0ce, font size: 9.0pt (12px), font weight: normal). Expected contrast ratio of 4.5:1

HTML element:
<span class="bootstrap-switch-handle-off bootstrap-switch-default" style="width: 44px;">OFF</span>
Selector: [.notificationAppCell[data-format="email"] > .bootstrap-switch-small.bootstrap-switch-indeterminate.bootstrap-switch-off > .bootstrap-switch-container > .bootstrap-switch-handle-off.bootstrap-switch-default]
Fix any of the following:
Element has insufficient color contrast of 3.82 (foreground color: #757575, background color: #eaeaea, font size: 9.0pt (12px), font weight: normal). Expected contrast ratio of 4.5:1