Merge bitcoindevkit#1829: ci: remove cc pin to fix CI error

979f9d1 ci: remove `cc` pin to fix CI error (Wei Chen)

Pull request description:

  ### Description
  `cc` dependency was unpinned to fix a clash with `cmake` that was causing CI errors.

  ### Changelog notice

  * Unpinned cc dependency.

  ### 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:
  ValuedMammal:
    ACK 979f9d1

Tree-SHA512: 53264e36153609e9a9ebf4f67993e1f99d11c65d6695c2ed3739dfed059f9467f20e7dc5b965507bb207f56c63525afe13e0f6c2ba619e19d2e60fab6f04a7b0

Author: ValuedMammal

ci/pin-msrv.sh

@@ -15,7 +15,6 @@ cargo update -p time --precise "0.3.20"
 cargo update -p home --precise "0.5.5"
 cargo update -p proptest --precise "1.2.0"
 cargo update -p url --precise "2.5.0"
-cargo update -p cc --precise "1.0.105"
 cargo update -p tokio --precise "1.38.1"
 cargo update -p tokio-util --precise "0.7.11"
 cargo update -p indexmap --precise "2.5.0"