fix: Upgraded Firestore and Storage dependencies

[hiranya911]

Upgraded dependencies:

% go get cloud.google.com/go/firestore
go: cloud.google.com/go/firestore upgrade => v1.5.0
go: downloading cloud.google.com/go/firestore v1.5.0
go: downloading cloud.google.com/go v0.75.0
go: downloading github.com/golang/protobuf v1.4.3
go: downloading google.golang.org/api v0.40.0
go: downloading google.golang.org/genproto v0.0.0-20210222152913-aa3ee6e6a81c
go: downloading github.com/jstemmer/go-junit-report v0.9.1
go: downloading google.golang.org/grpc v1.35.0
go: downloading golang.org/x/tools v0.1.0
go: downloading google.golang.org/protobuf v1.25.0
go: downloading golang.org/x/net v0.0.0-20201224014010-6772e930b67b
go: downloading golang.org/x/text v0.3.4
go: downloading golang.org/x/mod v0.4.1
go: downloading golang.org/x/sys v0.0.0-20210223095934-7937bea0104d
go: downloading go.opencensus.io v0.22.5
go: downloading golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5
go: downloading github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
go: downloading golang.org/x/oauth2 v0.0.0-20210218202405-ba52d332ba99
go: downloading google.golang.org/appengine v1.6.7
go: downloading github.com/google/go-cmp v0.5.4

Resolves #427