Update dart

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[github-actions]

Diff for 1a87cf2:

diff --git a/_bashbrew-cat b/_bashbrew-cat
index d619312..7c09197 100644
--- a/_bashbrew-cat
+++ b/_bashbrew-cat
@@ -1,12 +1,12 @@
 Maintainers: Alexander Thomas <[email protected]> (@athomas), Tony Pujals <[email protected]> (@subfuzion)
 GitRepo: https://github.com/dart-lang/dart-docker.git
 GitFetch: refs/heads/main
-GitCommit: b73710e1fd5fa709206bcd5878cb9e213012d57a
+GitCommit: d47542c0a1374da60caf74762ff629cececec77b
 
 Tags: 2.17.6-sdk, 2.17-sdk, 2-sdk, stable-sdk, sdk, 2.17.6, 2.17, 2, stable, latest
 Architectures: amd64, arm32v7, arm64v8
 Directory: stable/bullseye
 
-Tags: 2.18.0-271.4.beta-sdk, beta-sdk, 2.18.0-271.4.beta, beta
+Tags: 2.18.0-271.7.beta-sdk, beta-sdk, 2.18.0-271.7.beta, beta
 Architectures: amd64, arm32v7, arm64v8
 Directory: beta/bullseye
diff --git a/_bashbrew-list b/_bashbrew-list
index 98cf2d7..d2e3cdf 100644
--- a/_bashbrew-list
+++ b/_bashbrew-list
@@ -4,8 +4,8 @@ dart:2.17
 dart:2.17-sdk
 dart:2.17.6
 dart:2.17.6-sdk
-dart:2.18.0-271.4.beta
-dart:2.18.0-271.4.beta-sdk
+dart:2.18.0-271.7.beta
+dart:2.18.0-271.7.beta-sdk
 dart:beta
 dart:beta-sdk
 dart:latest
diff --git a/dart_beta/Dockerfile b/dart_beta/Dockerfile
index d613971..7f843aa 100644
--- a/dart_beta/Dockerfile
+++ b/dart_beta/Dockerfile
@@ -57,18 +57,18 @@ WORKDIR /root
 RUN set -eux; \
     case "$(dpkg --print-architecture)" in \
         amd64) \
-            DART_SHA256=d058dfd1487e7f8344b812f00ef4ee9dec455743a6c3c222c07c53083cbcd1e4; \
+            DART_SHA256=c0f0d03264e9fcc49feda733ac0c3472dd621d406656f169372f849c81b10380; \
             SDK_ARCH="x64";; \
         armhf) \
-            DART_SHA256=10a0d64eaa8e0ffbb229252ae08359a27af97a72026867e756c7c68a992d5544; \
+            DART_SHA256=e00442c3d69ae6b0c0904ddfa7e6dfcae8a9c49f32214ce7005b833c3b077c53; \
             SDK_ARCH="arm";; \
         arm64) \
-            DART_SHA256=2c280eded97e7f42df56302ac83f910f1b0c059817870d953e5b356add0156a4; \
+            DART_SHA256=84c7beeb46ebdcf323c62cdc5c5a95ae958115eb7e738b8d30b3fad43ffcdb4d; \
             SDK_ARCH="arm64";; \
     esac; \
     SDK="dartsdk-linux-${SDK_ARCH}-release.zip"; \
     BASEURL="https://storage.googleapis.com/dart-archive/channels"; \
-    URL="$BASEURL/beta/release/2.18.0-271.4.beta/sdk/$SDK"; \
+    URL="$BASEURL/beta/release/2.18.0-271.7.beta/sdk/$SDK"; \
     echo "SDK: $URL" >> dart_setup.log ; \
     curl -fLO "$URL"; \
     echo "$DART_SHA256 *$SDK" \

Relevant Maintainers:

• dart: @athomas @subfuzion