Fixes GitHub Actions to succeed again

.github/workflows/build.yml

@@ -5,6 +5,7 @@ name: build
 jobs:
   bongonet:
     strategy:
+      fail-fast: false
       matrix:
         # nightly, MSRV, and latest stable
         toolchain: [nightly, 1.72, 1.82.0]
@@ -34,6 +35,10 @@ jobs:
           toolchain: ${{ matrix.toolchain }}
           components: rustfmt, clippy
 
+      - name: Pin crates to versions for MSRV
+        run: |
+          [[ ${{ matrix.toolchain }} != 1.72.0 ]] || (cargo update -p boring --precise 4.13.0 && cargo update -p litemap --precise 0.7.4 && cargo update -p zerofrom --precise 0.1.5)
+
       - name: Run cargo fmt
         run: cargo fmt --all -- --check
 
@@ -55,4 +60,4 @@ jobs:
 
       - name: Run cargo machete
         run: |
-          [[ ${{ matrix.toolchain }} != 1.72.0 ]] || (cargo install cargo-machete && cargo machete)
+          [[ ${{ matrix.toolchain }} != 1.82.0 ]] || (cargo install cargo-machete --version 0.7.0 && cargo machete)