fix: Remove redundant explicitTypes config (#661)

When this option is defined, it spams the console with Ignored unknown option
[...] messages during test. explicitTest was removed from prettier in September
2022; Dependabot recently upgraded us to ^1.1.3, which is from March 2023.

prettier-solidity/prettier-plugin-solidity#730

.prettierrc

@@ -1,16 +1,14 @@
 {
   "printWidth": 120,
   "bracketSpacing": true,
-  "explicitTypes": "preserve",
   "tabWidth": 2,
   "overrides": [
     {
       "files": "*.sol",
       "options": {
         "tabWidth": 4,
         "useTabs": false,
-        "singleQuote": false,
-        "explicitTypes": "always"
+        "singleQuote": false
       }
     },
     {