build-unit-test-docker: update meson to 1.2.3

Yocto is using 1.2.2 but 1.2.3 was just released and has the fixes
for clang and C++23 that we have been carrying.  Enable this in CI.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Idfaa7b0d3894f169ab2b053b843cee707276ffe6
diff --git a/scripts/build-unit-test-docker b/scripts/build-unit-test-docker
index 1fe9844..8d27481 100755
--- a/scripts/build-unit-test-docker
+++ b/scripts/build-unit-test-docker
@@ -872,13 +872,10 @@
         inflection \
         isort \
         jsonschema \
+        meson==1.2.3 \
         protobuf \
         requests
 
-## Patch meson to fix Clang and C++23 on meson 1.1.1
-RUN pip3 install --break-system-packages \
-        https://github.com/williamspatrick/meson/archive/meson-1.1.1-plus-clang-cpp23.tar.gz
-
 RUN npm install -g \
         eslint@latest eslint-plugin-json@latest \
         markdownlint-cli@latest \