chore(ci): pin protoc version (#2389)

Fixes: #2386

Interop tests are failing since the [protobuf codegen requires the same version as
protoc](https://github.com/protocolbuffers/protobuf/blob/2ae8154f366a6d776bcc3ac931413bc4d99f578e/rust/release_crates/protobuf_codegen/src/lib.rs#L136-L148)
to work. This PR pins the protoc version to fix the tests.

Author: arjan-bal

.github/workflows/CI.yml

@@ -82,7 +82,9 @@ jobs:
     - uses: hecrj/setup-rust-action@v2
       with:
         components: clippy
-    - uses: taiki-e/install-action@protoc
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: protoc@3.31.1
     - name: Restore protoc plugin from cache
       id: cache-plugin
       uses: actions/cache@v4
@@ -115,7 +117,9 @@ jobs:
         toolchain: nightly-2025-03-27
     - uses: taiki-e/install-action@cargo-hack
     - uses: taiki-e/install-action@cargo-udeps
-    - uses: taiki-e/install-action@protoc
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: protoc@3.31.1
     - name: Restore protoc plugin from cache
       id: cache-plugin
       uses: actions/cache@v4
@@ -147,7 +151,9 @@ jobs:
     - uses: actions/checkout@v4
     - uses: hecrj/setup-rust-action@v2
     - uses: taiki-e/install-action@cargo-hack
-    - uses: taiki-e/install-action@protoc
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: protoc@3.31.1
     - name: Restore protoc plugin from cache
       id: cache-plugin
       uses: actions/cache@v4
@@ -198,7 +204,9 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: hecrj/setup-rust-action@v2
-    - uses: taiki-e/install-action@protoc
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: protoc@3.31.1
     - name: Restore protoc plugin from cache
       id: cache-plugin
       uses: actions/cache@v4
@@ -235,7 +243,9 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: hecrj/setup-rust-action@v2
-    - uses: taiki-e/install-action@protoc
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: protoc@3.31.1
     - name: Restore protoc plugin from cache
       id: cache-plugin
       uses: actions/cache@v4