Gihub Action job _grcov_ fails to compile "requires rustc 1.67.0"

[jtmoon79]

Describe the bug

Github Action job grov fails to compile.

  Downloaded libz-sys v1.1.12
error: failed to compile `grcov v0.8.19`, intermediate artifacts can be found at `/tmp/cargo-installYywHUw`

Caused by:
  package `time-macros v0.2.11` cannot be built because it requires rustc 1.67.0 or newer, while the currently active rustc version is 1.66.0
  Try re-running cargo install with `--locked`
     Summary Successfully installed rustfilt! Failed to install grcov (see error(s) above).
error: some crates failed to install
Error: The process '/home/runner/.cargo/bin/cargo' failed with exit code 101

rustc version used for github job grcov must be 1.67.0 or higher.

To Reproduce

1. run the rust Github Workflow in github

Environment:

• OS: Ubuntu 22
• s4 version: 0.6.67

Additional context

Started with PR #166 . See #166 (review)

[jtmoon79]

Job job_grcov was removed. MSRV has been bumped to 1.67.0.

Closed as Not Planned.