Update 1 NuGet dependencies

Author: nfbot

nanoFramework.Azure.Devices.Client/Azure.Devices.Client.nfproj

@@ -85,8 +85,8 @@
       <HintPath>..\packages\nanoFramework.System.Collections.1.4.0\lib\nanoFramework.System.Collections.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="nanoFramework.System.Text, Version=1.2.7.60109, Culture=neutral, PublicKeyToken=c07d481e9758c731">
-      <HintPath>..\packages\nanoFramework.System.Text.1.2.7\lib\nanoFramework.System.Text.dll</HintPath>
+    <Reference Include="nanoFramework.System.Text, Version=1.2.15.53169, Culture=neutral, PublicKeyToken=c07d481e9758c731">
+      <HintPath>..\packages\nanoFramework.System.Text.1.2.15\lib\nanoFramework.System.Text.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System.IO.Streams, Version=1.1.15.36091, Culture=neutral, PublicKeyToken=c07d481e9758c731">

nanoFramework.Azure.Devices.Client/packages.config

@@ -9,7 +9,7 @@
   <package id="nanoFramework.System.IO.Streams" version="1.1.15" targetFramework="netnanoframework10" />
   <package id="nanoFramework.System.Net" version="1.10.24" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Net.Http" version="1.5.30" targetFramework="netnano1.0" />
-  <package id="nanoFramework.System.Text" version="1.2.7" targetFramework="netnanoframework10" />
+  <package id="nanoFramework.System.Text" version="1.2.15" targetFramework="netnano1.0" />
   <package id="nanoFramework.System.Threading" version="1.1.8" targetFramework="netnano1.0" />
   <package id="Nerdbank.GitVersioning" version="3.5.113" developmentDependency="true" targetFramework="netnano1.0" />
 </packages>

nanoFramework.Azure.Devices.Client/packages.lock.json

@@ -58,9 +58,9 @@
       },
       "nanoFramework.System.Text": {
         "type": "Direct",
-        "requested": "[1.2.7, 1.2.7]",
-        "resolved": "1.2.7",
-        "contentHash": "ax4CrqYHNXoEBjaIW7dIv1CM4PxWcCc6lN2xSzGLZf7F/JZ0O7t0el86PPN2P/DfOyyBKSDAmrZjEx4q8mvgSw=="
+        "requested": "[1.2.15, 1.2.15]",
+        "resolved": "1.2.15",
+        "contentHash": "W6msO13WmdxzwcGK+fNLWOYZ4FH9NUVbhKVwICSLJg+esfKHF1HwVIPHZwfbrg51wBtnpb+mZTlA23Cx5CqNng=="
       },
       "nanoFramework.System.Threading": {
         "type": "Direct",