chore: modernize Project.toml (#105)

Update Project.toml to include compat bounds for stdlibs.

Author: tanmaykm

Project.toml

@@ -9,9 +9,11 @@ Sockets = "6462fe0b-24de-5631-8697-dd941f90decc"
 MbedTLS = "739be429-bea8-5141-9913-cc70e7f3736d"
 
 [compat]
-julia = "^1"
+julia = "1.6"
+Dates = "1.6"
 DataStructures = "^0.18"
 MbedTLS = "0.6.8, 0.7, 1"
+Sockets = "1.6"
 
 [extras]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"