Remove 1.18.1 / OTP 25

The compatibility matrix says it's supported but the runner says it's not.  Check on this later

Author: ihumanable

.github/workflows/ci.yml

@@ -73,8 +73,6 @@ jobs:
             otp-version: 26.2
           - elixir-version: 1.17.3
             otp-version: 27.2
-          - elixir-version: 1.18.1
-            otp-version: 25.3
           - elixir-version: 1.18.1
             otp-version: 26.2
           - elixir-version: 1.18.1

README.md

@@ -171,7 +171,7 @@ Tests automatically run against a matrix of OTP and Elixir Versions, see the [ci
 | 22           | ✅   | ✅   | ✅   | ✅   | ✅   | N/A  | N/A  | N/A  | N/A  | N/A  |
 | 23           | N/A  | ✅   | ✅   | ✅   | ✅   | ✅   | N/A  | N/A  | N/A  | N/A  |
 | 24           | N/A  | N/A  | ✅   | ✅   | ✅   | ✅   | ✅   | N/A  | N/A  | N/A  |
-| 25           | N/A  | N/A  | N/A   | N/A   | ✅   | ✅   | ✅   | ✅   | ✅   | ✅   |
+| 25           | N/A  | N/A  | N/A   | N/A   | ✅   | ✅   | ✅   | ✅   | ✅   | ?    |
 | 26           | N/A  | N/A  | N/A   | N/A   | N/A   | ✅   | ✅   | ✅   | ✅   | ✅   |
 | 27           | N/A  | N/A  | N/A   | N/A   | N/A   | N/A   | N/A   | N/A   | ✅   | ✅   |