Bump PeterO.Cbor from 2.4.2 to 4.0.0 in /examples/COSETests

Bumps [PeterO.Cbor](https://github.com/peteroupc/CBOR) from 2.4.2 to 4.0.0.
- [Release notes](https://github.com/peteroupc/CBOR/releases)
- [Changelog](https://github.com/peteroupc/CBOR/blob/master/History.md)
- [Commits](peteroupc/CBOR@v2.4.2...v4.0.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/COSETests/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="BouncyCastle" version="1.8.1" targetFramework="net40" />
-  <package id="PeterO.Cbor" version="2.4.2" targetFramework="net40" />
+  <package id="PeterO.Cbor" version="4.0.0" targetFramework="net40" />
   <package id="PeterO.Numbers" version="0.2.2" targetFramework="net40" />
 </packages>