tools: update vendored monitor deps

[g-k]

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[g-k]

in CI getting:

go test -v -covermode=count -count=1 -coverprofile=coverage_monitor.out go.mozilla.org/autograph/tools/autograph-monitor
panic: sql: Register called twice for driver postgres

goroutine 1 [running]:
database/sql.Register(0xeadbb5, 0x8, 0x1092380, 0x1924ae8)
	/usr/local/go/src/database/sql/sql.go:51 +0x1a0
go.mozilla.org/autograph/tools/autograph-monitor/vendor/go.mozilla.org/sops/vendor/github.com/lib/pq.init.0()
	/go/src/go.mozilla.org/autograph/tools/autograph-monitor/vendor/go.mozilla.org/sops/vendor/github.com/lib/pq/conn.go:49 +0x5c
FAIL	go.mozilla.org/autograph/tools/autograph-monitor	0.008s
Makefile:105: recipe for target 'testmonitor' failed

which (per mattes/migrate#322) is due to loading pq twice