.github: Bump tibdex/github-app-token from 1.8.0 to 2.1.0 #55

Job	Run time
race-root-integration (1/4)	1m 10s
test (amd64, -coverprofile=/tmp/coverage.out)	13m 27s
race-root-integration (2/4)	1m 12s
android	49s
test (amd64, -race, 1/3)	13m 57s
race-root-integration (3/4)	1m 11s
test (amd64, -race, 2/3)	5m 15s
race-root-integration (4/4)	1m 8s
cross (linux, arm64)	3m 5s
test (amd64, -race, 3/3)	5m 5s
fuzz	6m 54s
cross (linux, 386)	2m 59s
test (386)	13m 25s
cross (linux, loong64)	3m 5s
ios	38s
cross (linux, arm, 5)	4m 31s
race-build	3m 25s
tailscale_go	27s
cross (linux, arm, 7)	4m 13s
cross (darwin, amd64)	2m 59s
vm	0s
wasm	7m 28s
cross (darwin, arm64)	3m 16s
windows	7m 52s
cross (windows, amd64)	2m 45s
depaware	28s
cross (windows, arm64)	2m 37s
go_generate	1m 0s
cross (freebsd, amd64)	2m 52s
go_mod_tidy	23s
cross (openbsd, amd64)	2m 52s
licenses	7s
cross (plan9, amd64)	18s
staticcheck (linux, amd64)	2m 51s
staticcheck (windows, amd64)	2m 47s
staticcheck (darwin, amd64)	2m 51s
staticcheck (windows, 386)	2m 38s
check_mergeability	4s
notify_slack	4s
	2h 12m 8s

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