ci: drop Node 20 from Angular 22 matrix, point compat 21 at a21

Angular 22's CLI requires Node >=22.22.3, so the Latest build matrix can
never pass on Node 20.x; its failure fail-fast-cancelled the healthy 22.x
and 24.x legs. Drop 20.x from the Latest matrix.

The compat 'Angular 21' entry still copied compat/latest, which is now
Angular 22 — so 21 was untested and 22 ran twice. Point it at the new
compat/a21 dir, giving a true 18-21 compat sweep plus 22 via Latest.

Author: CodeAndWeb

.github/workflows/ngx-translate-test.yml

@@ -16,7 +16,7 @@ jobs:
 
         strategy:
             matrix:
-                node-version: [20.x, 22.x, 24.x]
+                node-version: [22.x, 24.x]
 
         steps:
             - uses: actions/checkout@v5
@@ -50,7 +50,7 @@ jobs:
                       config-dir: compat/a20
                     - angular-version: 21
                       node-version: 22.x
-                      config-dir: compat/latest
+                      config-dir: compat/a21
 
         steps:
             - uses: actions/checkout@v5