[Chore] Support ghc-9.8.1

Problem: there is ghc-9.10 for a while, but we don't
support it for several reasons.

Solution:
1. Permit text up to 2.1.1 (currently the latest one).
The rewrite rules still work and benchmarks produce expected
results.
2. Add explicit kind signatures for custom operators, because
otherwise there is a warning.
3. Add 9.10.1 to tested-with.
4. Update the CI config accordingly. 9.6 is still considered
as the main version (as it's used in the latest LTS resolver), so
we use it for 3 OS.

.github/workflows/ci.yml

@@ -41,8 +41,11 @@ jobs:
           - "9.4.5"
           - "9.6.3"
           - "9.8.1"
+          - "9.10.1"
         # Use only the "main" (usually latest) compiler version on non-Linux
         exclude:
+          - os: macOS-latest
+            ghc: 9.10.1
           - os: macOS-latest
             ghc: 9.8.1
           - os: macOS-latest
@@ -53,6 +56,8 @@ jobs:
             ghc: 9.0.2
           - os: macOS-latest
             ghc: 8.10.7
+          - os: windows-latest
+            ghc: 9.10.1
           - os: windows-latest
             ghc: 9.8.1
           - os: windows-latest

universum.cabal

@@ -19,6 +19,7 @@ tested-with:         GHC == 8.10.7
                    , GHC == 9.4.5
                    , GHC == 9.6.3
                    , GHC == 9.8.1
+                   , GHC == 9.10.1
 extra-doc-files:     CHANGES.md
                    , CONTRIBUTING.md
                    , README.md