ci: pin @angular/core ng update to version 9

Author: alan-agius4

tests/legacy-cli/e2e/tests/build/material.ts

@@ -6,7 +6,7 @@ import { updateJsonFile } from '../../utils/project';
 const snapshots = require('../../ng-snapshot/package.json');
 
 export default async function () {
-  await ng('add', '@angular/material');
+  await ng('add', '@angular/material@9');
 
   const isSnapshotBuild = getGlobalVariable('argv')['ng-snapshots'];
   if (isSnapshotBuild) {
@@ -26,7 +26,7 @@ export default async function () {
 
     await silentNpm('install');
   } else {
-    await silentNpm('install', '@angular/material-moment-adapter');
+    await silentNpm('install', '@angular/material-moment-adapter@9');
   }
 
   await silentNpm('install', 'moment');

tests/legacy-cli/e2e/tests/update/update-1.0.ts

@@ -13,7 +13,7 @@ export default async function() {
   await ng('update', '@angular/cli');
   await useBuiltPackages();
   await silentNpm('install');
-  await ng('update', '@angular/core', ...extraUpdateArgs);
+  await ng('update', '@angular/core@9', ...extraUpdateArgs);
   await useCIDefaults('one-oh-project');
   await ng('generate', 'component', 'my-comp');
   await ng('test', '--watch=false');

tests/legacy-cli/e2e/tests/update/update-1.7-longhand.ts

@@ -12,6 +12,6 @@ export default async function() {
   await ng('update', '@angular/cli', '--migrate-only', '--from=1.7.1');
   await useBuiltPackages();
   await silentNpm('install');
-  await ng('update', '@angular/core', ...extraUpdateArgs);
+  await ng('update', '@angular/core@9', ...extraUpdateArgs);
   await ng('build');
 }

tests/legacy-cli/e2e/tests/update/update-1.7.ts

@@ -15,7 +15,7 @@ export default async function() {
   await ng('update', '@angular/cli');
   await useBuiltPackages();
   await silentNpm('install');
-  await ng('update', '@angular/core', ...extraUpdateArgs);
+  await ng('update', '@angular/core@9', ...extraUpdateArgs);
   await useCIDefaults('latest-project');
   await ng('generate', 'component', 'my-comp');
   await ng('test', '--watch=false');

tests/legacy-cli/e2e/tests/update/update-7.0.ts

@@ -42,7 +42,7 @@ export default async function() {
   await silentNpm('install');
 
   // Update Angular.
-  await ng('update', '@angular/core', ...extraUpdateArgs);
+  await ng('update', '@angular/core@9', ...extraUpdateArgs);
 
   // Run CLI commands.
   await ng('generate', 'component', 'my-comp');