Remove the bitcoind_28_0 feature, assume a newer Bitcoin Core

This no longer seems necessary - v28 was released 15 months ago, the
Esplora docker setup uses v30, and the tests were updated to use v29
(in the parent commit).

Author: shesek

.github/workflows/rust.yml

@@ -29,22 +29,6 @@ jobs:
     - name: Run tests (Bitcoin mode, REST+Electrum)
       run: RUST_LOG=debug cargo test
 
-  test-bitcoin-28:
-    runs-on: ubuntu-22.04
-    steps:
-    - run: sudo apt-get update && sudo apt-get install libfuse2
-    - uses: actions/checkout@v4
-    - uses: dtolnay/rust-toolchain@1.75.0
-    - uses: Swatinem/rust-cache@v2
-    - name: Download bitcoind 28.0
-      run: |
-        curl -sSL https://bitcoincore.org/bin/bitcoin-core-28.0/bitcoin-28.0-x86_64-linux-gnu.tar.gz | tar -xz
-        chmod +x bitcoin-28.0/bin/bitcoind
-    - name: Run tests (Bitcoin 28.0, REST+Electrum)
-      run: RUST_LOG=debug cargo test --features bitcoind_28_0
-      env:
-        BITCOIND_EXE: ${{ github.workspace }}/bitcoin-28.0/bin/bitcoind
-
   test-electrum-raw:
     runs-on: ubuntu-22.04
     steps:

Cargo.toml

@@ -26,7 +26,6 @@ otlp-tracing = [
     "opentelemetry-semantic-conventions",
     "electrs_macros/otlp-tracing"
 ]
-bitcoind_28_0 = []
 
 [dependencies]
 arraydeque = "0.5.1"

tests/rest.rs

@@ -1040,7 +1040,7 @@ fn test_rest_reorg() -> Result<()> {
 }
 
 // bitcoin 28.0 only tests - submitpackage
-#[cfg(all(not(feature = "liquid"), feature = "bitcoind_28_0"))]
+#[cfg(not(feature = "liquid"))]
 #[test]
 fn test_rest_submit_package() -> Result<()> {
     let (rest_handle, rest_addr, mut tester) = common::init_rest_tester().unwrap();