Upgrade to Rust v1.49.0 (bp #14810) (#14811)

* Upgrade to Rust v1.49.0

(cherry picked from commit cbffab7850)

# Conflicts:
#	core/src/crds_value.rs

* rebase

Co-authored-by: Michael Vines <mvines@gmail.com>

scripts/coverage.sh

@@ -10,7 +10,7 @@ if ! command -v grcov; then
   exit 1
 fi
 
-if [[ ! "$(grcov --version)" =~ 0.6.1 ]]; then
+if [[ ! "$(grcov --version)" =~ 0.[67].1 ]]; then
   echo Error: Required grcov version not installed
 
   echo "Installed version: $(grcov --version)"