go.mod: Specify that we use the Go 1.17 language in this module

The main motivation here is that we were apparently using bit shifting
with signed shift amounts even though modern Go toolchains seem to raise
that as an error if the go.mod file selects a language version less than
Go 1.13.

Go 1.17 is therefore newer than we strictly need to solve that particular
problem, but gets us caught up with a relatively release of the language.
This alone doesn't break compatibility for anyone using older versions of
Go with HCL, since the Go toolchain will still attempt to compile modules
targeting later versions and will only mention the newer language version
if compilation would already have failed for some other reason.

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