RenovateBot: Update dependency blinker to v1.8.1

This MR contains the following updates:

Package	Update	Change
blinker	patch	==1.8.0 -> ==1.8.1

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Release Notes

pallets-eco/blinker (blinker)

v1.8.1

Compare Source

Released 2024-04-28

• Restore identity handling for str and int senders. 🇵🇷148
• Fix deprecated blinker.base.WeakNamespace import. 🇵🇷149
• Fix deprecated blinker.base.receiver_connected import. 🇵🇷153
• Use types from collections.abc instead of typing. 🇵🇷150
• Fully specify exported types as reported by pyright. 🇵🇷152

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