Bump dart from fd65b23 to f379cd3 in /.github/docker (#2388)

Bumps dart from `fd65b23` to `f379cd3`.

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| dart | [>= 3.4.a, < 3.5] |
| dart | [>= 3.5.a, < 3.6] |
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.github/docker/Dockerfile.dart

@@ -1,3 +1,3 @@
-FROM dart:3.11.2-sdk@sha256:fd65b23467d84e6470e8050753b976f31229571b79c373b807262d4967aff12b
+FROM dart:3.11.2-sdk@sha256:f379cd388f850db3833823244f5b66c2b23ad739876467e8a3dfa72706e3eee9
 
 CMD echo this is a dummy file used to automate dependency upgrades for plugins