Pin setup-dart and ecosystem workflows to main

.github/workflows/health.yaml

diff --git a/.github/workflows/health.yaml b/.github/workflows/health.yaml
index b3461a3..88dce8d 100644
--- a/.github/workflows/health.yaml
+++ b/.github/workflows/health.yaml
@@ -9,7 +9,7 @@
 
 jobs:
   health:
-    uses: dart-lang/ecosystem/.github/workflows/health.yaml@78abf72b3cfcc7c6c822032d8915153019fe79b7 # main
+    uses: dart-lang/ecosystem/.github/workflows/health.yaml@27c2fc841818cce349e1f424af51cca9ea381f47 # main
     with:
       checks: "publish"
       fail_on: "publish"

.github/workflows/post_summaries.yaml

diff --git a/.github/workflows/post_summaries.yaml b/.github/workflows/post_summaries.yaml
index a2fb378..f652050 100644
--- a/.github/workflows/post_summaries.yaml
+++ b/.github/workflows/post_summaries.yaml
@@ -16,6 +16,6 @@
 
 jobs:
   upload:
-    uses: dart-lang/ecosystem/.github/workflows/post_summaries.yaml@78abf72b3cfcc7c6c822032d8915153019fe79b7 # main
+    uses: dart-lang/ecosystem/.github/workflows/post_summaries.yaml@27c2fc841818cce349e1f424af51cca9ea381f47 # main
     permissions:
       pull-requests: write

.github/workflows/publish_frontend_server_client.yaml

diff --git a/.github/workflows/publish_frontend_server_client.yaml b/.github/workflows/publish_frontend_server_client.yaml
index e55d8a1..604d026 100644
--- a/.github/workflows/publish_frontend_server_client.yaml
+++ b/.github/workflows/publish_frontend_server_client.yaml
@@ -12,7 +12,7 @@
     if: ${{ github.repository_owner == 'dart-lang' }}
     permissions:
       id-token: write
-    uses: dart-lang/setup-dart/.github/workflows/publish.yml@a5bff6576dfc51b47eb77d4b7084bba6a4daf8d2 # main
+    uses: dart-lang/setup-dart/.github/workflows/publish.yml@a1d8526c926344e01ba48a7368788c05ac98cb29 # main
     with:
       working-directory: frontend_server_client
       use-flutter: false

.github/workflows/publish_webdev.yaml

diff --git a/.github/workflows/publish_webdev.yaml b/.github/workflows/publish_webdev.yaml
index 591a922..1d3614e 100644
--- a/.github/workflows/publish_webdev.yaml
+++ b/.github/workflows/publish_webdev.yaml
@@ -12,7 +12,7 @@
     if: ${{ github.repository_owner == 'dart-lang' }}
     permissions:
       id-token: write
-    uses: dart-lang/setup-dart/.github/workflows/publish.yml@6eae1842087284e3f4d3b0b2ae847d72e6046d8c # dart-lang/setup-dart#206
+    uses: dart-lang/setup-dart/.github/workflows/publish.yml@a1d8526c926344e01ba48a7368788c05ac98cb29 # main
     with:
       working-directory: webdev
       sdk: dev