RiverLea: 1.2.1-5.81 - fixes three regressions, one visual change

[vingle]

Overview

This PR fixes three regressions:

• RL hadn't yet integrated the rendered Radio Button fix
• Selected Rows in SearchKit tables are illegible in Walbrook
• Select2 accordions didn't work and showed expanded.
  In addition a visual change was made (still getting used to the multi-branch workflow). Strictly speaking this should go into master not the RC, but as we're still in the RL test period and it's a minor change hopefully it's ok.

Before: 1.2.0-5.81.beta

Select2 accordions:

Select in SK table:

Visual change - giant alert for 'no items' in table:

After: 1.2.1-5.81.beta

Select2 accordions:

Select in SK table:

Visual change - smaller alert for 'no items' in table
(NB - while there is a contrast ratio issue in the action buttons on the right - these buttons shouldn't be used anyway because this UX is to apply actions to multiple rows):

Technical Details

• FIXED - integrated this fix to rendered radio buttons: dev/core#5550 Regression fix: reset text-rendered radio button width in confirmation screens #31345
• FIXED - text colour on selected rows illegible: https://lab.civicrm.org/extensions/riverlea/-/issues/94#note_174585
• FIXED - accordions inside Select2 now work. Some small tidying of Select2 list borders/padding.
• CHANGED - reduced size of 'not found' alerts in SearchKit tables: AdminUI: tweak TabMember markup and translation #31605

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