Bump firebase.google.com/go/v4 in /hashira-web/functions

Bumps [firebase.google.com/go/v4](https://github.com/firebase/firebase-admin-go) from 4.6.1 to 4.7.0.
- [Release notes](https://github.com/firebase/firebase-admin-go/releases)
- [Commits](firebase/firebase-admin-go@v4.6.1...v4.7.0)

---
updated-dependencies:
- dependency-name: firebase.google.com/go/v4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

hashira-web/functions/go.mod

@@ -4,6 +4,6 @@ go 1.16
 
 require (
 	cloud.google.com/go/firestore v1.6.1
-	firebase.google.com/go/v4 v4.6.1
+	firebase.google.com/go/v4 v4.7.0
 	github.com/google/go-cmp v0.5.6
 )

hashira-web/functions/go.sum

@@ -49,8 +49,8 @@ cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RX
 cloud.google.com/go/storage v1.10.0 h1:STgFzyU5/8miMl0//zKh2aQeTyeaUH3WN9bSUiJ09bA=
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-firebase.google.com/go/v4 v4.6.1 h1:rvWAqW1tRVHJJuJUof8SIdL1Cc4k1yaPbO+wLKKJZiQ=
-firebase.google.com/go/v4 v4.6.1/go.mod h1:UgGSTOhEZVbB2L3dQ3z4pThDTiH869i8TDAZKnrHKbU=
+firebase.google.com/go/v4 v4.7.0 h1:c9bz0AtNJv30I+VJJWgzlGFeu/9PW1j1w6OHd+zNZJc=
+firebase.google.com/go/v4 v4.7.0/go.mod h1:UgGSTOhEZVbB2L3dQ3z4pThDTiH869i8TDAZKnrHKbU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=