Samples maintenance (#435)

place_tracker/pubspec.lock

@@ -69,6 +69,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_plugin_android_lifecycle:
+    dependency: transitive
+    description:
+      name: flutter_plugin_android_lifecycle
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.7"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -80,7 +87,14 @@ packages:
       name: google_maps_flutter
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.0"
+    version: "0.5.27+1"
+  google_maps_flutter_platform_interface:
+    dependency: transitive
+    description:
+      name: google_maps_flutter_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
   image:
     dependency: transitive
     description:
@@ -123,6 +137,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.4.0"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.2"
   quiver:
     dependency: transitive
     description:
@@ -156,6 +177,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
+  stream_transform:
+    dependency: transitive
+    description:
+      name: stream_transform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
   string_scanner:
     dependency: transitive
     description:
@@ -190,7 +218,7 @@ packages:
       name: uuid
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "2.0.4"
   vector_math:
     dependency: transitive
     description:
@@ -207,4 +235,4 @@ packages:
     version: "3.6.1"
 sdks:
   dart: ">=2.6.0 <3.0.0"
-  flutter: ">=0.11.9 <2.0.0"
+  flutter: ">=1.12.13+hotfix.5 <2.0.0"