build: upgrade go directive in go.mod to 1.17

[Juneezee]

This PR upgrades the go directive in go.mod file by running go mod tidy -go=1.17 to enable module graph pruning and lazy module loading.

Note 1: This does not prevent users with earlier Go versions from successfully building packages from this module.

Note 2: The additional require directive is used to record indirect dependencies for Go 1.17 or higher, see https://go.dev/ref/mod#go-mod-file-go.

[codecov]

Codecov Report

Merging #2049 (63e2b32) into master (aada6f9) will increase coverage by 0.20%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master    #2049      +/-   ##
==========================================
+ Coverage   91.57%   91.77%   +0.20%     
==========================================
  Files          33       36       +3     
  Lines        2921     2968      +47     
==========================================
+ Hits         2675     2724      +49     
+ Misses        157      156       -1     
+ Partials       89       88       -1     

Impacted Files	Coverage Δ
context.go	88.04% <ø> (+1.10%)	⬆️
group.go	100.00% <ø> (ø)
router.go	96.50% <ø> (-0.02%)	⬇️
context_fs_go1.16.go	80.00% <80.00%> (ø)
echo_fs_go1.16.go	95.83% <95.83%> (ø)
bind.go	89.47% <100.00%> (+0.06%)	⬆️
echo.go	95.14% <100.00%> (+0.93%)	⬆️
group_fs_go1.16.go	100.00% <100.00%> (ø)
middleware/recover.go	84.21% <100.00%> (+2.96%)	⬆️

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[lammel]

Looks good to me. Go is moving forward to allowing reproducable builds with Go 1.18. So moving in that direction seems fine to me.
Thoughs @aldas @pafuent ?

[aldas]

I was little bit vary of this because of older Go versions. This is due my ignorance of that directive. But we already have go 1.15 and still support 1.14 and nobody is complaining - so it is probably ok.