Set minimum Julia version to 1.6 and clean up stdlib compat

The julia compat was "0.7, 1" which caused CI 'min' to resolve to
Julia 0.7.0 where modern test deps (Aqua 0.8) can't be installed.
Also simplify stdlib compat entries that used the <0.0.1 pattern.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ViralBShah

Project.toml

@@ -14,19 +14,19 @@ HTTP = "cd3eb016-35fb-5094-929b-558a96fad6f3"
 HTTPExt = "HTTP"
 
 [compat]
-Pkg = "<0.0.1, 0.7, 1"
+Pkg = "1"
 Requires = "1"
-UUIDs = "<0.0.1, 0.7, 1"
-julia = "0.7, 1"
+UUIDs = "1"
+julia = "1.6"
 Aqua = "0.8"
 CSVFiles = "1"
 CodecZlib = "0.7"
 ColorTypes = "0.12"
 Downloads = "1.4"
 FilePathsBase = "0.9"
 HTTP = "1"
-Random = "<0.0.1, 0.7, 1"
-Test = "<0.0.1, 0.7, 1"
+Random = "1"
+Test = "1"
 
 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"