CI: bump GHC 9.6 to 9.6.4 and actions/cache to v4

Also drop special runs on ci-* and release-* branches.
Always go through PRs.

.github/workflows/haskell-ci.yml

@@ -8,22 +8,18 @@
 #
 # For more information, see https://github.com/andreasabel/haskell-ci
 #
-# version: 0.17.20231112
+# version: 0.17.20240127
 #
-# REGENDATA ("0.17.20231112",["github","alex.cabal"])
+# REGENDATA ("0.17.20240127",["github","alex.cabal"])
 #
 name: Haskell-CI
 on:
   push:
     branches:
       - master
-      - ci-*
-      - release-*
   pull_request:
     branches:
       - master
-      - ci-*
-      - release-*
 jobs:
   linux:
     name: Haskell-CI - Linux - ${{ matrix.compiler }}
@@ -41,9 +37,9 @@ jobs:
             compilerVersion: 9.8.1
             setup-method: ghcup
             allow-failure: false
-          - compiler: ghc-9.6.3
+          - compiler: ghc-9.6.4
             compilerKind: ghc
-            compilerVersion: 9.6.3
+            compilerVersion: 9.6.4
             setup-method: ghcup
             allow-failure: false
           - compiler: ghc-9.4.8
@@ -225,7 +221,7 @@ jobs:
           $CABAL v2-build $ARG_COMPILER $ARG_TESTS $ARG_BENCH --dry-run all
           cabal-plan
       - name: restore cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}
           path: ~/.cabal/store
@@ -261,7 +257,7 @@ jobs:
           rm -f cabal.project.local
           $CABAL v2-build $ARG_COMPILER --disable-tests --disable-benchmarks all
       - name: save cache
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         if: always()
         with:
           key: ${{ runner.os }}-${{ matrix.compiler }}-${{ github.sha }}

alex.cabal

@@ -23,7 +23,7 @@ build-type: Simple
 
 tested-with:
         GHC == 9.8.1
-        GHC == 9.6.3
+        GHC == 9.6.4
         GHC == 9.4.8
         GHC == 9.2.8
         GHC == 9.0.2

cabal.haskell-ci

@@ -1,4 +1,4 @@
-branches: master ci-* release-*
+branches: master
 
 -- -- For bootstrapping:
 -- apt: alex happy