rvm: switch binary serialization to postcard (#582)

Move RVM binary encoding from bincode to postcard and bump the format version. Update test helpers, docs, changelog, and refresh lockfiles after the swap.

Closes #575

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

.github/workflows/rust-clippy.yml

@@ -49,9 +49,9 @@ jobs:
 
       - name: Run rust-clippy
         run: cargo xtask clippy --sarif rust-clippy-results.sarif
-        continue-on-error: true
 
       - name: Upload analysis results to GitHub
+        if: ${{ hashFiles('rust-clippy-results.sarif') != '' }}
         uses: github/codeql-action/upload-sarif@89a39a4e59826350b863aa6b6252a07ad50cf83e # v3.29.11
         with:
           sarif_file: rust-clippy-results.sarif