Bump BraveRewards library to 1.21.x

[kylehickinson]

No description provided.

[LaurenWags]

Verified passed on iPad mini with iOS 13 running 1.24 (21.3.24.11)

Verified test plan from #3405 (comment)

Sanity check rewards

1. Clean profile

• Installed 1.24 (21.3.24.11)
• Confirmed Rewards not enabled by default
• Enabled Rewards
• Navigated to various sites, confirmed sites known to be verified are reflected as such from panel
• Confirmed auto contribute was performed successfully

2. Upgrade profile (Rewards not enabled prior to upgrade)

• Installed 1.23.1
• Confirmed Rewards not enabled
• Upgraded to 1.24
• Confirmed Rewards not enabled after upgrade

3. Upgrade profile (Rewards enabled prior to upgrade)

• Installed 1.23.1
• Enabled Rewards
• Upgraded to 1.24
• Confirmed Rewards still enabled after upgrade

Sanity check ads

1. Clean profile

• Installed 1.24 (21.3.24.11)
• Confirmed Rewards not enabled by default
• Confirmed ads not shown when Rewards not enabled
• Enabled Rewards
• Confirmed able to see page classification in logs
• Confirmed NTP views recorded in logs
• Confirmed able to see click, view, dismiss events in logs
• Encountered and logged reduced ads delivery on iOS #3458

2. Upgrade profile (Rewards not enabled prior to upgrade)

• Installed 1.23.1
• Confirmed Rewards not enabled
• Upgraded to 1.24
• Confirmed Rewards not enabled after upgrade
• Confirmed ads not received after upgrade

3. Upgrade profile (Rewards enabled prior to upgrade)

• Installed 1.23.1
• Enabled Rewards
• Upgraded to 1.24
• Confirmed rewards still enabled after upgrade
• Confirmed ads received after upgrade

4. Clean profile

• Installed 1.24 (21.3.25.18)
• Enabled Rewards
• Confirmed able to see click, view, dismiss, landed events in logs
• Confirmed tokens redeemed with the server successfully
• Confirmed expected number of ads viewed is shown in "Rewards Debug Menu"
• Confirmed expected balance is shown in "Rewards Debug Menu"
• Confirmed ads shown at 2per hour cadence

Sanity check sync

1. Clean profile

• Install 1.24 (21.3.25.18)
• Confirmed able to join sync chain using code words
• Confirmed able to join sync chain using QR code
• Confirmed able to start a sync chain and have laptop join
• Confirmed bookmarks from prior to sync were added to laptop
• Confirmed bookmarks from prior to sync on laptop were added to iOS device
• Confirmed bookmarks added post sync to iOS device were synced to laptop
• Confirmed bookmarks added post sync to laptop were synced to iOS device

2. Upgrade profile

• Install 1.23.1
• Join a sync chain and have bookmarks synced
• Upgrade to 1.24
• Confirm sync chain retained after upgrade
• Confirm newly created bookmarks on iOS sync to laptop
• Confirm newly created bookmarks on laptop sync to iOS

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Verified passed on iPhone 7 with iOS 14 running 1.24 (21.3.31.15)

Verified the Brave Rewards/Ads and Sync sections of the manual test run: #3473