feat: update to go 1.21.0, add log/slog support

[ttys3]

go 1.21.0 stdlib slog provides structured logging, in which log records include a message, a severity level, and various other attributes expressed as key-value pairs.

see https://pkg.go.dev/log/slog

[codecov]

Codecov Report

Merging #72 (ea06f45) into master (d6826ff) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   98.79%   98.80%   +0.01%     
==========================================
  Files          12       14       +2     
  Lines         581      588       +7     
==========================================
+ Hits          574      581       +7     
  Misses          5        5              
  Partials        2        2              

Files Changed	Coverage Δ
staticrules.go	100.00% <ø> (ø)
internal/checkers/filter.go	100.00% <100.00%> (ø)
internal/checkers/slog.go	100.00% <100.00%> (ø)
internal/checkers/zap.go	100.00% <100.00%> (ø)
loggercheck.go	94.35% <100.00%> (ø)

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[ttys3]

Oops, I found things missing ...

it has something like Zap:

// Group returns an Attr for a Group Value.
// The first argument is the key; the remaining arguments
// are converted to Attrs as in [Logger.Log].
//
// Use Group to collect several key-value pairs under a single
// key on a log line, or as the result of LogValue
// in order to log a single value as multiple Attrs.
func Group(key string, args ...any) Attr {
	return Attr{key, GroupValue(argsToAttrSlice(args)...)}
}

[ttys3]

OK. fixed

[timonwong]

I think it's not the best time to drop support for golang<1.21 for now

[ttys3]

go 1.21 and 1.22 is the only supported Stable versions now. https://go.dev/dl/

is this OK now?

[timonwong]

Maybe a build constraint?