pin pre-commit hooks to SHA

Careful review should be paid when using
`pre-commit autoupdate` (which only uses tags).

Author: 2bndy5

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v6.0.0
+    rev: 3e8a8703264a2f4a69428a0aa4dcb512790b2c8c # v6.0.0
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
@@ -9,6 +9,6 @@ repos:
       - id: mixed-line-ending
         args: ["--fix=lf"]
   - repo: https://github.com/streetsidesoftware/cspell-cli
-    rev: v9.2.0
+    rev: 3749de0c02b93bbbe0eae9d7d72da1ecf3c7a2e0 # v9.2.0
     hooks:
       - id: cspell