build(deps): bump go-isatty to 0.0.23

[steipete]

Summary

• update direct dependency github.com/mattn/go-isatty from v0.0.22 to v0.0.23
• retain existing terminal detection behavior on supported crawlkit targets

Upstream delta: Haiku gets a non-terminal stub; the dependency Go directive moves down to 1.20. No exported API change.

Proof

• upstream tag v0.0.23 points to 4bc9b75fc8738b40f30b420ad17c00e8a151c3bf
• GOWORK=off go mod verify
• GOWORK=off go mod tidy
• git diff --exit-code -- go.mod go.sum after commit
• GOWORK=off go vet ./...
• GOWORK=off go test -count=1 ./... (18 packages passed)
• GOWORK=off go test -race -count=1 ./... (18 packages passed)
• GOWORK=off go run golang.org/x/vuln/cmd/govulncheck@v1.4.0 ./... (0 reachable vulnerabilities)
• external consumer of releasecheck.StderrIsTerminal: false through pipes, true under a PTY
• built crawlctl: --version returned dev; --help listed all commands
• AutoReview clean: no accepted/actionable findings; confidence 0.99