Version dependencies are required in production (#7779)

Author: paulb777

Package.swift

@@ -137,12 +137,12 @@ let package = Package(
     .package(
       name: "abseil",
       url: "https://github.com/firebase/abseil-cpp-SwiftPM.git",
-      .revision("973d27376eedfb8f0f0a324be4b4121d44808dc9")
+      from: "0.20200225.1"
     ),
     .package(
       name: "gRPC",
       url: "https://github.com/firebase/grpc-SwiftPM.git",
-      .revision("b54af2c0d3b77209ccc8dc25af902c31a2095943")
+      "1.28.3" ..< "1.29.0"
     ),
     .package(
       name: "OCMock",
@@ -152,7 +152,7 @@ let package = Package(
     .package(
       name: "leveldb",
       url: "https://github.com/firebase/leveldb.git",
-      .revision("e4e8ab44a2781a3656b4b5852e71c07fd18fecfa")
+      "1.22.2" ..< "1.23.0"
     ),
     // Branches need a force update with a run with the revision set like below.
     //   .package(url: "https://github.com/paulb777/nanopb.git", .revision("564392bd87bd093c308a3aaed3997466efb95f74"))