upgrade the lower bound for termcolor from 1.1.0 to 1.4.0

[alexanderkjall]

If you try to build it with a lower version, it fails, for example like this with 1.3.0:

error[E0599]: the method `clone` exists for struct `SearchWorker<Buffer>`, but its trait bounds were not satisfied
    --> crates/core/main.rs:181:37
     |
 181 |         let mut searcher = searcher.clone();
     |                                     ^^^^^ method cannot be called on `SearchWorker<Buffer>` due to unsatisfied trait bounds
     |
    ::: crates/core/search.rs:230:1
     |
 230 | pub(crate) struct SearchWorker<W> {
     | --------------------------------- method `clone` not found for this struct because it doesn't satisfy `SearchWorker<Buffer>: Clone`
     |
    ::: /home/capitol/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/termcolor-1.3.0/src/lib.rs:1183:1
     |
1183 | pub struct Buffer(BufferInner);
     | ----------------- doesn't satisfy `Buffer: Clone`
     |
note: trait bound `Buffer: Clone` was not satisfied
    --> crates/core/search.rs:229:10
     |
 229 | #[derive(Clone, Debug)]
     |          ^^^^^ unsatisfied trait bound introduced in this `derive` macro
     = help: items from traits can only be used if the trait is implemented and in scope
     = note: the following trait defines an item `clone`, perhaps you need to implement it:
             candidate #1: `Clone`

error[E0282]: type annotations needed
   --> crates/core/main.rs:190:17
    |
190 |             let search_result = match searcher.search(&haystack) {
    |                 ^^^^^^^^^^^^^
...
197 |             if search_result.has_match() {
    |                ------------- type must be known at this point
    |
help: consider giving `search_result` an explicit type
    |
190 |             let search_result: /* Type */ = match searcher.search(&haystack) {
    |                              ++++++++++++

from: https://salsa.debian.org/rust-team/debcargo-conf/-/blob/master/src/ripgrep/debian/patches/bump-termcolor.diff?ref_type=heads