deps: update x/tools and gopls to fe37c9e1

[leitzler]

• all: replace all usages of os/exec with golang.org/x/sys/execabs fe37c9e1
• internal/lsp/source: handle possible nil pointer in rename check a46736d9
• gopls/doc: rewrite troubleshooting.md e0d20156
• gopls/doc: clean up and slightly reorganize documentation d78b04bd
• gopls/doc: move contents of x/tools/gopls: defining the workspace root golang/go#36899 to documentation 1bdb73f5
• gopls/internal/regtest: fix synchronization for TestUseGoplsMod f9643685
• gopls/doc/vscode.md: update vscode setting example 8b4aab62
• gopls/internal/regtest: avoid flake in TestGoModInvalidesOnSave 9a6582cd
• internal/lsp/cache: compare file size when invalidating file cache f618651c
• internal/lsp/fake: use hash rather than mtime to identify workdir files 7646fae9
• internal/lsp/source: rename uses of embedded fields 45115c1c
• go/packages: don't crash if given an invalid overlay 1e6ecd4b
• internal/imports: handle un-downloaded modules 88ba5d0b
• copyright: test that all files in the repo have copyright notices d33bae44
• gopls/doc/emacs.md: describe configuration for eglot 1b1bb645
• internal/lsp/cmd: add licenses command 7905ceac
• gopls/internal/hooks: create included licenses text 9c811dba
• gopls/internal/regtest: fix TestUnimportedCompletions 1462c254
• gopls: use standard command doc comment format e1c06e46
• Revert "go/analysis/passes/structtag: recognize multiple keys per tag" 21398c4d
• internal/lsp/cache: fix panic in GOPATH mode 5bd8423e
• internal/lsp/cache: fix module paths in nested module error messages 6f6e4b65
• gopls/internal/regtest: skip regtests on android-amd64-emu 7de0487e
• all: add copyright notices to files that are missing them 92778473
• go/packages: remove -mod, -modfile flags from build flags for go version 5d655790
• internal/lsp/source: return all field funcs from outgoing callhierarchy b8e0803c
• gopls: update link to nvim-lspconfig gopls configuration 6c3993fd
• gopls/doc: add additional information on CI in contributing.md 66568f37
• gopls: bump gofumpt to v0.1.0 961d08dc
• gopls/internal/regtest: support multiple workspace folders 2e889ff4
• cmd/goyacc: double ACTSIZE, NSTATE and TEMPSTATE eb9b40eb
• internal/lsp: avoid panic during interface assertion 2993f551
• go/analysis/passes/fieldalignment: add command c4dccaf3
• internal/lsp: save all possible keys for analyses, codelenses 9ca8607e
• internal/lsp: restructure user options (CL 278433 continued) d2d86cca

[leitzler]

No change in govim, merging.