[flutter_releases] Flutter beta 3.7.0-1.1.pre Framework Cherrypicks (#116673)

* Create candidate branch version flutter-3.7-candidate.1 for beta

* Update Engine revision to 4971c5b2e7e66cb7abc858b4e0203ce7d39f6ff1 for beta release 3.7.0-1.1.pre
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index aff0a93..c8683d5 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-ec5de9b810ef0cde91cece0a23ee8517fd40a880
+4971c5b2e7e66cb7abc858b4e0203ce7d39f6ff1
diff --git a/bin/internal/release-candidate-branch.version b/bin/internal/release-candidate-branch.version
new file mode 100644
index 0000000..929170a
--- /dev/null
+++ b/bin/internal/release-candidate-branch.version
@@ -0,0 +1 @@
+flutter-3.7-candidate.1