fixes

analysis_options.yaml

diff --git a/analysis_options.yaml b/analysis_options.yaml
index 0d2bc74..c9dd2bb 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -25,10 +25,6 @@
     # allow self-reference to deprecated members (we do this because otherwise we have
     # to annotate every member in every test, assert, etc, when we deprecate something)
     deprecated_member_use_from_same_package: ignore
-    # Ignore analyzer hints for updating pubspecs when using Future or
-    # Stream and not importing dart:async
-    # Please see https://github.com/flutter/flutter/pull/24528 for details.
-    sdk_version_async_exported_from_core: ignore
 
 linter:
   rules:
@@ -85,6 +81,7 @@
     - cancel_subscriptions
     # - cascade_invocations # not yet tested
     - cast_nullable_to_non_nullable
+    - collection_methods_unrelated_type
     # - close_sinks # not reliable enough
     # - comment_references # blocked on https://github.com/dart-lang/linter/issues/1142
     # - constant_identifier_names # needs an opt-out https://github.com/dart-lang/linter/issues/204
@@ -103,14 +100,12 @@
     - hash_and_equals
     - implementation_imports
     # - invariant_booleans # too many false positives: https://github.com/dart-lang/linter/issues/811
-    - iterable_contains_unrelated_type
     # - join_return_with_assignment # not required by flutter style
     - leading_newlines_in_multiline_strings
     - library_names
     - library_prefixes
     - library_private_types_in_public_api
     # - lines_longer_than_80_chars # not required by flutter style
-    - list_remove_unrelated_type
     # - literal_only_boolean_expressions # too many false positives: https://github.com/dart-lang/sdk/issues/34181
     - missing_whitespace_between_adjacent_strings
     - no_adjacent_strings_in_list

test/src/fake_process_manager.dart

diff --git a/test/src/fake_process_manager.dart b/test/src/fake_process_manager.dart
index ab2a9a7..74f0c72 100644
--- a/test/src/fake_process_manager.dart
+++ b/test/src/fake_process_manager.dart
@@ -128,8 +128,8 @@
     Map<String, String>? environment,
     bool includeParentEnvironment = true,
     bool runInShell = false,
-    Encoding stdoutEncoding = systemEncoding,
-    Encoding stderrEncoding = systemEncoding,
+    Encoding? stdoutEncoding = systemEncoding,
+    Encoding? stderrEncoding = systemEncoding,
   }) {
     if (commandsThrow) {
       throw const ProcessException('failed_executable', <String>[]);
@@ -144,8 +144,8 @@
     Map<String, String>? environment,
     bool includeParentEnvironment = true,
     bool runInShell = false,
-    Encoding stdoutEncoding = systemEncoding,
-    Encoding stderrEncoding = systemEncoding,
+    Encoding? stdoutEncoding = systemEncoding,
+    Encoding? stderrEncoding = systemEncoding,
   }) {
     if (commandsThrow) {
       throw const ProcessException('failed_executable', <String>[]);