CI: caching: add GHC 9.2.1

Author: Anton-Latukha

.github/workflows/caching.yml

@@ -73,7 +73,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ["9.0.1", '8.10.7', '8.10.6', "8.8.4", "8.6.5"]
+        ghc: ["9.2.1", "9.0.1", '8.10.7', '8.10.6', "8.8.4", "8.6.5"]
         os: [ubuntu-latest, macOS-latest, windows-latest]
         cabal: ['3.6']
 
@@ -105,6 +105,14 @@ jobs:
           # `&&` insures `rm -f` return is positive.
           # Many platforms also have `alias cp='cp -i'`.
           rm -f -v cabal.project && cp -v cabal-ghc901.project cabal.project
+      - if: matrix.ghc == '9.2.1'
+        name: (GHC 9.2.1) Use modified `cabal.project`
+        run: |
+          # File has some protections preventing regular `rm`.
+          # (most probably sticky bit is set on $HOME)
+          # `&&` insures `rm -f` return is positive.
+          # Many platforms also have `alias cp='cp -i'`.
+          rm -f -v cabal.project && cp -v cabal-ghc921.project cabal.project
       - if: runner.os == 'Windows' && matrix.ghc == '8.8.4'
         name: (Windows,GHC 8.8) Modify `cabal.project` to workaround segfaults
         run: |