Update rustc version (#135)

*Description of changes:*
Bumping the version of rustc to 1.81 in our Dockerfile to fix any docker
errors

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Dockerfile

@@ -18,7 +18,7 @@ RUN npm install aws-aws-distro-opentelemetry-node-autoinstrumentation-$(node -p
 RUN npm install
 
 # Stage 2: Build the cp-utility binary
-FROM public.ecr.aws/docker/library/rust:1.75 as builder
+FROM public.ecr.aws/docker/library/rust:1.81 as builder
 
 WORKDIR /usr/src/cp-utility
 COPY ./tools/cp-utility .