Update mainline nginx to 1.29.4

While at it, update mainline images to use Alpine Linux 3.23.

Author: thresheek

update.sh

@@ -12,7 +12,7 @@ declare branches=(
 # Current nginx versions
 # Remember to update pkgosschecksum when changing this.
 declare -A nginx=(
-    [mainline]='1.29.3'
+    [mainline]='1.29.4'
     [stable]='1.28.0'
 )
 
@@ -55,7 +55,7 @@ declare -A debian=(
 )
 
 declare -A alpine=(
-    [mainline]='3.22'
+    [mainline]='3.23'
     [stable]='3.21'
 )
 
@@ -72,7 +72,7 @@ declare -A rev=(
 # revision/tag in the previous block
 # Used in builds for architectures not packaged by nginx.org
 declare -A pkgosschecksum=(
-    [mainline]='249858446828ace0c81ea3e057135aa368f3dab83430cf867bb9fc32598948f29c4bd50908491da704536af1106aa87553f6a76cc126c6833dc9b14dd00564b8'
+    [mainline]='e8b08060e10b8d8819e03533cb4922992ea138bcbf16a89a90593db719f17d78afa1cc4785592260c9c897753ec28c8b0d02c01df4b7d0e0ed286d0a42cef68c'
     [stable]='517bc18954ccf4efddd51986584ca1f37966833ad342a297e1fe58fd0faf14c5a4dabcb23519dca433878a2927a95d6bea05a6749ee2fa67a33bf24cdc41b1e4'
 )