Update CI to test on 22.0 instead of 0.21

0.21 does not have support for bech32m

Author: sanket1729

.github/workflows/rust.yml

@@ -93,5 +93,5 @@ jobs:
           override: true
       - name: Running cargo
         env:
-          BITCOINVERSION: 0.21.0
+          BITCOINVERSION: '22.0'
         run: ./contrib/test.sh