chore: bump minimum Angular peer dependency from 16 to 18

v18 uses effect(), takeUntilDestroyed(), and stable signal APIs
that require Angular 18+. The test matrix already only covers 18+.

Author: CodeAndWeb

projects/http-loader/package.json

@@ -12,8 +12,8 @@
     "author": "Andreas Löw / CodeAndWeb GmbH, Olivier Combe",
     "license": "MIT",
     "peerDependencies": {
-        "@angular/common": ">=16",
-        "@angular/core": ">=16",
+        "@angular/common": ">=18",
+        "@angular/core": ">=18",
         "@ngx-translate/core": ">=18"
     },
     "sideEffects": false

projects/ngx-translate/package.json

@@ -19,8 +19,8 @@
     "author": "Andreas Löw / CodeAndWeb GmbH, Olivier Combe",
     "license": "MIT",
     "peerDependencies": {
-        "@angular/common": ">=16",
-        "@angular/core": ">=16",
+        "@angular/common": ">=18",
+        "@angular/core": ">=18",
         "rxjs": ">=7"
     },
     "sideEffects": false