Ensure the default Rust toolchain is 1.73.0

Author: arik-so

.github/actions/install-dependencies/action.yml

@@ -24,6 +24,11 @@ runs:
                 mkdir -p ${{ inputs.destination }}/bin
                 git clone --branch 0.0.125-bindings https://github.com/lightningdevkit/rust-lightning ${{ inputs.destination }}/rust-lightning
                 git clone --branch 0.0.125 https://github.com/lightningdevkit/ldk-c-bindings ${{ inputs.destination }}/ldk-c-bindings
+        -   name: Configure default Rust toolchain
+            shell: bash
+            run: |
+                rustup install 1.73.0
+                rustup default 1.73.0
         -   name: Install Rust, required targets
             if: ${{ inputs.configureRustNightly == 'true' }}
             shell: bash