Fix the CI for the MSRV

- Pin cargo-platform to v0.1.5.
- Pin crossbeam-epoch to v0.9.15.
- Pin regex to v1.9.4.
- Pin regex-automata to v0.3.7.
- Pin aho-corasick to v1.0.5.
- Pin bytecount to v0.6.3.
- Pin memchr to v2.5.0.
- Pin value-bag to v1.4.1.

.ci_extras/pin-crate-vers-msrv.sh

@@ -13,3 +13,16 @@ cargo update -p regex --precise 1.9.6
 cargo update -p memchr --precise 2.6.2
 cargo update -p h2 --precise 0.3.20
 cargo update -p actix-rt --precise 2.8.0
+cargo update -p cargo-platform --precise 0.1.5
+cargo update -p crossbeam-epoch --precise 0.9.15
+
+# To use memchr 2.5.0, we need to use regex 1.9.4 and regex-automata 0.3.7.
+cargo update -p regex --precise 1.9.4
+cargo update -p regex-automata --precise 0.3.7
+
+# The following crates require rustc to support target feature "neon",
+# which is unstable in Rust 1.60.0.
+cargo update -p aho-corasick --precise 1.0.5
+cargo update -p bytecount --precise 0.6.3
+cargo update -p memchr --precise 2.5.0
+cargo update -p value-bag --precise 1.4.1