Cherry-pick #3784 into an 8.0.9+1 release (#3800)

4 cherry-picks + a version bump:

1. cherry-pick 8be17e1

    Fix flutter CI with re-internalized snippets tool (#3776)

2. cherry-pick ae1f184

    Use package:analyzer/source/source.dart (#3780)

3. cherry-pick db3a0ec

    Restrict validation of runtime renderer files to a single, target version of (#3778)
    the analyzer package.

4. cherry-pick 36db497

    Fix referencing an aliased type parameter. (#3784)

    What is an aliased type parameter? Good question! `typedef TD<T> = T;` is such
    an alias. The fix is pretty simple, we just weren't previously handling this
    case, or being safe.

5. Bump to 8.0.9+1

---------

Co-authored-by: Konstantin Scheglov <scheglov@google.com>

.github/workflows/test.yaml

@@ -3,9 +3,9 @@ name: Test
 on:
   # Run CI on pushes to the main branch, and on PRs against main.
   push:
-    branches: [ main ]
+    branches: [ main, eight-oh-nine-one ]
   pull_request:
-    branches: [ main ]
+    branches: [ main, eight-oh-nine-one ]
   schedule:
     - cron: 0 15 * * *
 

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 8.0.9+1
+
+* Fix referencing an aliased type parameter. (#3784)
+
 ## 8.0.9
 
 * Deprecate the `missingCodeBlockLanguage` warning. This is replaced with the

dartdoc_options.yaml

@@ -1,4 +1,4 @@
 dartdoc:
   linkToSource:
     root: '.'
-    uriTemplate: 'https://github.com/dart-lang/dartdoc/blob/v8.0.9/%f%#L%l%'
+    uriTemplate: 'https://github.com/dart-lang/dartdoc/blob/v8.0.9+1/%f%#L%l%'