fix: pin apt package versions in key-provider Dockerfile

Restore version pinning for git and build-essential matching jammy.

Author: kvinwang

key-provider-build/Dockerfile.key-provider

@@ -4,8 +4,8 @@
 FROM gramineproject/gramine:1.9-jammy@sha256:84b3d222e0bd9ab941f0078a462af0dbc5518156b99b147c10a7b83722ac0c38
 
 RUN apt-get update && apt-get install -y \
-    git \
-    build-essential \
+    git=1:2.34.1-1ubuntu1.17 \
+    build-essential=12.9ubuntu3 \
     && rm -rf /var/lib/apt/lists/*
 
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain 1.85 -y