Merge #389: ci: fix to work with bdk 0.28.2 and msrv 1.61.0

1da01b4 ci: change rust stable version to 0.71.0 (Steve Myers)
f1ba03b ci: fix to work with bdk 0.28.1 and msrv 1.61.0 (Steve Myers)

Pull request description:

  ### Description

  Fixes CI to work with BDK 0.28.x and MSRV 1.61.0. For MSRV had to pin two dependencies.

  ### Notes to the reviewers

  I also updated in CI our 'stable" version of rust to be current stable which is `1.71.0`.

  ### Changelog notice

  None, only CI changes.

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  thunderbiscuit:
    ACK 1da01b4.

Tree-SHA512: 72f7d8dbef791daebf3f4d9d92722f1f3780d173501673ca6f47af39dd2102c85944ba603e4e9213d44a294ab1cec43dff82213fe53c5dea663279473be64a15

.github/workflows/cont_integration.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - version: 1.63.0 # STABLE
+          - version: 1.71.0 # STABLE
             clippy: true
           - version: 1.61.0 # MSRV
     steps:
@@ -46,6 +46,11 @@ jobs:
       - name: Update toolchain
         run: rustup update
 
+      - name: Pin dependencies for MSRV
+        if: matrix.rust.version == '1.61.0'
+        run: |
+          cargo update -p hashlink --precise "0.8.1"
+          cargo update -p tokio --precise "1.29.1"
       - name: Build
         run: cargo build