Bump go-sdk to 27f29c1 (Content-Type media type parsing fix)

Upgrades github.com/modelcontextprotocol/go-sdk from v1.5.0 to
v1.5.1-0.20260403154220-27f29c1cef3b which includes proper media type
parsing for Content-Type headers, fixing the strict string matching
that rejected application/json; charset=utf-8.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: IrynaKulakova

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/josephburnett/jd/v2 v2.5.0
 	github.com/lithammer/fuzzysearch v1.1.8
 	github.com/microcosm-cc/bluemonday v1.0.27
-	github.com/modelcontextprotocol/go-sdk v1.5.0
+	github.com/modelcontextprotocol/go-sdk v1.5.1-0.20260403154220-27f29c1cef3b
 	github.com/muesli/cache2go v0.0.0-20221011235721-518229cd8021
 	github.com/shurcooL/githubv4 v0.0.0-20240727222349-48295856cce7
 	github.com/shurcooL/graphql v0.0.0-20230722043721-ed46e5a46466

go.sum

@@ -41,6 +41,8 @@ github.com/microcosm-cc/bluemonday v1.0.27 h1:MpEUotklkwCSLeH+Qdx1VJgNqLlpY2KXwX
 github.com/microcosm-cc/bluemonday v1.0.27/go.mod h1:jFi9vgW+H7c3V0lb6nR74Ib/DIB5OBs92Dimizgw2cA=
 github.com/modelcontextprotocol/go-sdk v1.5.0 h1:CHU0FIX9kpueNkxuYtfYQn1Z0slhFzBZuq+x6IiblIU=
 github.com/modelcontextprotocol/go-sdk v1.5.0/go.mod h1:gggDIhoemhWs3BGkGwd1umzEXCEMMvAnhTrnbXJKKKA=
+github.com/modelcontextprotocol/go-sdk v1.5.1-0.20260403154220-27f29c1cef3b h1:mB8zdpP8SX1TEqnEZpV2hHD30EQXivsZl4AP9hgm7F8=
+github.com/modelcontextprotocol/go-sdk v1.5.1-0.20260403154220-27f29c1cef3b/go.mod h1:gggDIhoemhWs3BGkGwd1umzEXCEMMvAnhTrnbXJKKKA=
 github.com/muesli/cache2go v0.0.0-20221011235721-518229cd8021 h1:31Y+Yu373ymebRdJN1cWLLooHH8xAr0MhKTEJGV/87g=
 github.com/muesli/cache2go v0.0.0-20221011235721-518229cd8021/go.mod h1:WERUkUryfUWlrHnFSO/BEUZ+7Ns8aZy7iVOGewxKzcc=
 github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=