test: ensure update tests update to 8.x

Author: clydin

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@8', ...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@8', ...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@8', ...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

@@ -44,7 +44,7 @@ export default async function() {
   await silentNpm('install');
 
   // Update Angular.
-  await ng('update', '@angular/core', ...extraUpdateArgs);
+  await ng('update', '@angular/core@8', ...extraUpdateArgs);
 
   // Run CLI commands.
   await ng('generate', 'component', 'my-comp');