Commit Cargo.lock.msrv for CI usage

Author: faern

.github/workflows/rust.yml

@@ -119,6 +119,7 @@ jobs:
           # when updating this, also update rust-version in Cargo.toml
           toolchain: 1.31.0
           override: true
+      - run: cp Cargo.lock.msrv Cargo.lock
       - run: cargo build
       - run: cargo build --features reopen-1,reopen-03,meta-logging-in-format,syslog-3
   msrv_date_based:
@@ -136,6 +137,7 @@ jobs:
           profile: minimal
           toolchain: 1.48.0
           override: true
+      - run: cp Cargo.lock.msrv Cargo.lock
       - run: cargo build --features date-based
   msrv_syslog_4:
     name: MSRV Compatability - fern/syslog-4
@@ -152,6 +154,7 @@ jobs:
           profile: minimal
           toolchain: 1.51.0
           override: true
+      - run: cp Cargo.lock.msrv Cargo.lock
       - run: cargo build --features syslog-4
   msrv_syslog_6:
     name: MSRV Compatability - fern/syslog-6
@@ -168,6 +171,7 @@ jobs:
           profile: minimal
           toolchain: 1.59.0
           override: true
+      - run: cp Cargo.lock.msrv Cargo.lock
       - run: cargo build --features syslog-6
   fmt_and_clippy:
     name: Optional Lints