Bump h2 from 0.3.24 to 0.3.26 in /tests/hello-rustls #670

Job	Run time
Build Docker Image	0s
linux (x86_64-unknown-linux-musl, x86_64-musl)	1m 4s
macos	3m 38s
linux (i686-unknown-linux-musl, i686-musl)	1m 2s
windows (x64, x86_64-pc-windows-msvc)	2m 51s
linux (aarch64-unknown-linux-musl, aarch64-musl)	1m 23s
windows (x86, i686-pc-windows-msvc)	3m 25s
linux (armv7-unknown-linux-musleabihf, armv7-musleabihf)	1m 0s
linux (armv7-unknown-linux-musleabi, armv7-musleabi)	1m 2s
windows (arm64, aarch64-pc-windows-msvc)	3m 28s
Release	0s
	18m 53s

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