miniflux: update to 2.2.18. #67732

Job	Run time
Lint templates	43s
Build packages (armv7l, x86_64, glibc, linux/amd64, 0)	2m 17s
Build packages (armv6l-musl, x86_64-musl, musl, linux/amd64, 0)	3m 5s
Build packages (i686, i686, glibc, linux/386, 1)	3m 7s
Build packages (x86_64, x86_64, glibc, linux/amd64, 1)	2m 49s
Build packages (x86_64-musl, x86_64-musl, musl, linux/amd64, 1)	2m 29s
Build packages (aarch64-musl, x86_64-musl, musl, linux/amd64, 0)	2m 19s
Build packages (aarch64, x86_64, glibc, linux/amd64, 0)	3m 3s
	19m 52s

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