Update postgres Docker tag to v16 (#125)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| postgres | service | major | `15` -> `16` |

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.github/workflows/analysis-coverage.yml

@@ -209,7 +209,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres:15
+        image: postgres:16
         env:
           POSTGRES_USER: root
           POSTGRES_PASSWORD: rootpassword
@@ -615,7 +615,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres:15
+        image: postgres:16
         env:
           POSTGRES_USER: root
           POSTGRES_PASSWORD: rootpassword