pigeonhole: update to version 0.5.21.1

Release notes:
```
v0.5.21.1 2024-08-14  Aki Tuomi <aki.tuomi@open-xchange.com>

	- sieve: When saving to local storage failed after a successful action
	  in sieve (e.g. redirect, vacation), the mail was reported as
	  successfully delivered, although it was lost locally.
```
Copy&pasted from
https://raw.githubusercontent.com/dovecot/pigeonhole/0.5.21.1/NEWS

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

Author: BKPepe

mail/pigeonhole/Makefile

@@ -8,14 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dovecot-pigeonhole
-PKG_VERSION:=0.5.21
+PKG_VERSION:=0.5.21.1
 PKG_RELEASE:=1
 
 DOVECOT_VERSION:=2.3
 
 PKG_SOURCE:=dovecot-$(DOVECOT_VERSION)-pigeonhole-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://pigeonhole.dovecot.org/releases/$(DOVECOT_VERSION)
-PKG_HASH:=1ca71d2659076712058a72030288f150b2b076b0306453471c5261498d3ded27
+PKG_HASH:=0377db284b620723de060431115fb2e7791e1df4321411af718201d6925c4692
 
 PKG_MAINTAINER:=W. Michael Petullo <mike@flyn.org>
 PKG_LICENSE:=LGPL-2.1-or-later